Exhibit 10.21

                         SYNTRON, INC. - BENTHOS, INC.
                         HYDROPHONE LICENSE AGREEMENT


This Agreement made effective as of the fifth day of December, 1996, regardless
of the date of last signature hereto, is by and between SYNTRON, INC., a for
profit corporation duly organized and existing under the laws of the State of
Delaware and having an office at 17200 Park Row, Houston, Texas 77084-4925
(LICENSOR) and BENTHOS, INC., a for profit corporation duly organized and
existing under the laws of the State of Massachusetts and having an office at 49
Edgerton Drive, North Falmouth, Massachusetts 02556-2826 (LICENSEE).

WITNESSETH
- ----------

WHEREAS, LICENSOR is dedicated to fostering and advancing scientific research
within its own organization and is responsible for developing inventions made by
employees of LICENSOR by evaluating invention disclosures, pursuing patents and
licensing patents which are obtained thereon; and

WHEREAS, LICENSOR is the owner of certain "Proprietary Rights" as later defined
herein, and has the right to grant licenses thereunder; and

WHEREAS, LICENSOR'S Hydrophone design arose out of research performed at the
place of business of LICENSOR and in part by the inventor named in the patent
described in Proprietary Rights, which inventor has the capabilities and
experience to exploit Proprietary Rights; and

WHEREAS, LICENSEE recognizes the validity of the LICENSOR'S Proprietary Rights;
and

WHEREAS, LICENSEE is capable of manufacturing, distributing, using, leasing and
selling the "Licensed Product" as later defined herein, and LICENSEE desires to
obtain an exclusive license under the Proprietary Rights to manufacture, use,
distribute and sell the Licensed Product upon the terms and conditions
hereinafter set forth;

NOW, therefore, in consideration of the premises and mutual covenants contained
herein, and with intent to be legally bound, the parties hereto agree as
follows:

DISPUTES ARISING BETWEEN THE PARTIES HERETO SHALL BE RESOLVED BY BINDING
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ARBITRATION AS PROVIDED HEREINAFTER.
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                                  Page 1 of 14

 
ARTICLE I - DEFINITIONS

For purpose of this Agreement, the following words and phrases shall have the
following meanings:

1.1   "LICENSEE" shall refer to the corporate entity Benthos, Inc. and all
      entities a) in which LICENSEE owns more than fifty percent (50%) equity
      interest or b) over which LICENSEE may, directly or indirectly,
      effectively influence or control the conduct of such entity.

1.2   "LICENSOR" shall refer to the corporate entity Syntron, Inc. and all
      entities a) in which LICENSOR owns more than fifty percent (50%) equity
      interest or b) over which LICENSOR may, directly or indirectly,
      effectively influence or control the conduct of such entity.

1.3   "Proprietary Rights" shall mean all of the following LICENSOR intellectual
      property:

         a.   United States Patent Application No. 08/545,111 thereon; and
              United States Patent Application No. 08/579,327 thereon.

         b.   Any reissues, extensions, divisional applications,
              continuations, or continuations in part of the Patent
              described in (a) above, and any Patents issuing as a result of
              the Patent Applications thereon; and described in (a) above;
              and

         c.   All foreign counterparts to the items described in (a) and (b) 
              above; and

         d.   All information transmitted to Benthos, Inc. via the
              information packet labeled "Proposed Syntron Hydrophone
              10/l/96"; and

         e.   Other trade secrets, confidential information, know-how and
              other information related to the subject matter hereof
              conveyed by any means to LICENSEE by LICENSOR; and

         f.   All information based upon the LICENSOR's intellectual
              property described in items (a) through and including (e)
              above including, but not limited to, information developed by
              LICENSEE hereunder and any derivative of, enhancement to, or
              other extension of LICENSOR's intellectual property provided
              by LICENSOR to LICENSEE hereunder or related hereto.

1.4   A "Licensed Product" shall mean any product or material which is
      covered in whole or in part by Proprietary Rights, or is manufactured
      using a process which is covered in whole or in part by Proprietary
      Rights, that is manufactured by LICENSEE for its own use or Commercial
      Sale.

1.5   A "Licensed Process" shall mean any process which is covered in whole
      or in part by Proprietary Rights and/or LICENSEE's trade secrets,
      confidential information, know-how, and other information relating
      thereto, including without limitation, LICENSEE's proprietary technical
      information pertaining to LICENSEE's existing manufacturing processes
      and know-how imparted in the Documentation as later defined herein.

                                  Page 2 of 14

 
1.6   "Net Selling Price" shall mean the actual gross selling price of
      Licensed Products collected by LICENSEE upon a Commercial Sale by
      LICENSEE, excluding all packaging, instructional, shipping, insurance,
      taxes or other charges made to any purchaser and evidenced as a
      separately priced item on LICENSEE's invoice to the purchaser, and also
      excluding reasonable and customary trade discounts, documented
      commissions to third party sales representatives and/or agency fees
      and/or similar documented selling costs, if any, provided any
      combination of which shall not exceed fifteen percent (15%) of the
      gross selling price and none of such costs are a component of
      LICENSEE's auditable overhead rates, and refunds or credits allowed or
      taken by the purchaser on account of returns or defective articles.

1.7   "Commercial Sale" shall mean any transaction which transfers to any
      purchaser, who is not in any way related to LICENSEE, physical
      possession of and title to Licensed Products, after which transfer
      LICENSEE has no right or power to determine directly or indirectly the
      purchaser's resale price, if any, or to benefit directly or indirectly
      from such resale price other than by increased sales of the Licensed
      Products.

1.8   "Documentation" shall mean the documentation to be generated by
      LICENSEE hereunder to a complete set of manufacturing (including but
      not limited to piece part, subassembly and related specifications)
      drawings, process documentation, work instructions, test procedures and
      software, and design verification parameters and performance criteria,
      and any future updates thereto as and when initiated by LICENSEE.

ARTICLE II - GRANT
- ------------------

2.1   Subject to the terms and conditions hereof, LICENSOR hereby grants to
      LICENSEE and LICENSEE hereby accepts an exclusive, worldwide license to
      make, distribute, use, and sell the Licensed Products, to practice the
      Licensed Processes, and to utilize the Documentation for a period of five
      (5) years commencing on the effective date of this Agreement. The
      foregoing notwithstanding, LICENSEE and LICENSOR expressly acknowledge and
      agree that the granting by LICENSOR to LICENSEE of such exclusive license
      shall only limit for a period of three (3) years commencing on the
      effective date of this Agreement LICENSOR from making, or granting a
      license to a current or future LICENSOR Affiliate entity to make on behalf
      of LICENSOR or LICENSOR Affiliate entity, the Licensed Product, practice
      the Licensed Processes and utilize the Documentation, for LICENSOR's or
      LICENSOR Affiliate entity's use, lease, or sale as a component part of a
      product of LICENSOR or LICENSOR's Affiliate entity. The term of this
      Agreement may be extended by written agreement of the parties at any time
      prior to the expiration of the then current term of the Agreement. In the
      event of expiration or termination of the exclusive License granted by
      LICENSOR to LICENSEE hereinabove, LICENSEE shall have a non-exclusive
      worldwide license to make, distribute, use, and sell the Licensed
      Products, to practice the Licensed Processes, and to utilize the
      Documentation, on the same terms and conditions as this Agreement.
      Concurrently, LICENSEE hereby grants a reciprocal, royalty free,
      perpetual, non-exclusive license to LICENSOR with respect to utilization
      of LICENSEE's proprietary information embedded in and/or a part of the
      Licensed Processes and Documentation. The provisions herein with respect
      to these non-exclusive licenses shall survive the termination of this
      Agreement.

                                  Page 3 of 14

 
2.2   LICENSOR represents that it neither owns nor controls nor is aware of
      patent rights or other proprietary rights to technology which would
      prevent LICENSEE from enjoying the benefits of the rights granted to
      LICENSEE herein.

2.3   LICENSEE shall use all reasonable commercial efforts to bring to market
      the Licensed Products or Licensed Processes, including without limitation
      the generation of the Documentation. The initial design verification
      parameters and performance criteria have been mutually agreed between the
      parties hereto and are documented in Appendix A attached hereto and made a
      part hereof. The Documentation shall be deemed Work For Hire due to
      contemplation of the compensation to be provided to LICENSEE by LICENSOR
      in accordance with paragraph 4.1(B) hereof and shall be licensed to
      LICENSEE by LICENSOR under this Agreement and be subject to the terms and
      conditions hereof. Due to potential LICENSOR commercial impact known to
      and hereby acknowledged by LICENSEE, should LICENSEE fail to bring
      Licensed Products or Licensed Processes to market not later than 5 January
      1998 with a review of the status of final determination of the design path
      not later than 30 November 1997 and such failure is attributable to
      LICENSEE and LICENSOR is not in default hereunder, this Agreement may be
      terminated at the sole discretion of LICENSOR with forty-five (45) days'
      notice to LICENSEE notwithstanding other provisions herein to the contrary
      and the Documentation as it exists at the time of such termination shall
      be owned by LICENSOR and delivered to LICENSOR by LICENSEE at the time of
      such termination. All obligations of either LICENSEE or LICENSOR that by
      their nature would survive termination of this Agreement for any reason
      herein provided shall so survive.

2.4   LICENSEE agrees that any improvement, enhancement or derivative
      information or product it develops to, or that results from, the
      Proprietary Rights during the term of this Agreement, or any extension
      thereto, shall be disclosed to LICENSOR. LICENSOR shall have equal
      ownership of and/or proprietary rights to such improvement, enhancement or
      derivative information or product. LICENSEE's rights to use of any such
      improvement, enhancement or derivative information or product LICENSEE
      develops to, or that results from, the Proprietary Rights shall be equally
      licensed to LICENSEE hereunder as the original subject matter of this
      Agreement. In the event either party intends to protect said improvement,
      enhancement or derivative information or product it develops to, or that
      results from, the Proprietary Rights by filing patents, such party shall
      provide notice to the other. In the event that such party is LICENSEE and
      where the practice of resulting patent applications and patents would
      infringe Proprietary Rights, LICENSEE shall provide to LICENSOR an
      exclusive, perpetual, worldwide, royalty-free license under such patent
      applications and patents for such rights as may have been granted under,
      or derived from, such patent applications and patents. Where the practice
      of resulting patent applications and patents would not infringe
      Proprietary Rights, LICENSEE shall provide to LICENSOR a non-exclusive,
      perpetual, worldwide, royalty-free license under such patent applications
      and patents for such rights as may have been granted under, or derived
      from, such patent applications and patents.

                                  Page 4 of 14

 
ARTICLE III - EXPORT CONTROLS

3.1   It is understood that LICENSOR and LICENSEE are subject to United States
      law and regulations controlling the export of technical data, computer
      software, laboratory prototypes and other commodities, and that their
      obligations hereunder are contingent on compliance with applicable United
      States export laws and regulations. The transfer of certain technical data
      and commodities may require a license from the cognizant agency of the
      United States Government and/or written assurances by LICENSEE that
      LICENSEE shall not export data or commodities to certain foreign countries
      without prior approval of such agency. LICENSOR neither represents that a
      license shall not be required nor that, if required, it shall be issued.
      LICENSEE shall be responsible for payment of all reasonable costs,
      attendant to securing said licenses.

ARTICLE IV - FEE, COST BASIS/REMUNERATION, ROYALTIES, AND REPORTING

4.1.  For the rights, privileges and license granted hereunder, LICENSEE shall
      pay a license fee, provide preferred selling price and delivery status,
      and pay royalties to LICENSOR in the manner hereinafter provided to the
      end of the term of the Proprietary Rights, which shall be until the last
      patent to expire of all patents included within Proprietary Rights, or
      until this Agreement shall be terminated as hereinafter provided:

      (A)   LICENSEE agrees to pay LICENSOR a License Issue fee in the amount of
            Ten Dollars ($10.00);

      (B.1) LICENSOR shall pay LICENSEE an amount equal to $ 158,500.00 (One
            Hundred Fifty-eight Thousand Five Hundred Dollars) for the
            completion of the engineering required to place the Licensed Product
            in a high volume manufacturing design state including without
            limitation the generation of the Documentation. The fee hereinabove
            to be paid by LICENSOR to LICENSEE will include full compensation
            for all engineering design, manufacturing design, the generation and
            copying of the Documentation and any future updates thereto as and
            when initiated by LICENSEE and prototype materials required to
            fabricate parts for proof of design. Said fee shall be deemed earned
            by LICENSEE on 1) the successful completion of testing to the
            satisfaction of LICENSOR and LICENSEE to a mutually agreed upon set
            of performance specifications documented in Appendix B attached
            hereto and made a part hereof and 2) delivery to LICENSOR by
            LICENSEE of a complete and accurate reproducible copy of the then
            current Documentation. Once the fee is earned as stated above,
            payment of said fee shall be effected in stages as follows:

                  a) By issuance of an Invoice with Net payment terms for, and
            payment of, $ 108,500.00 which shall be due and payable on the later
            of 5 January 1998 or 30 days following the date upon which the total
            fee is deemed earned as stated above, and 

                  b) By retention by LICENSEE of $0.50/unit of the $2.20/unit
            portion of the royalty due LICENSOR on the first 100,000 units sold
            by LICENSEE to a third party in accordance with paragraph 4.1.(F)
            hereof.

                                  Page 5 of 14

 
            The work product of LICENSEE's services, including results, and all
            ideas, plans, developments, and inventions which LICENSEE conceives
            or reduces to practice during the course of performance under this
            subparagraph 4.1.(B) and this Agreement shall be the exclusive
            property of LICENSOR. This information, material, plans, and any
            such ideas or inventions shall be deemed LICENSOR Proprietary
            Information and shall not be disclosed to anyone outside of LICENSOR
            or used by LICENSEE outside the terms and conditions of this
            Agreement or used by others without the prior written consent of
            LICENSOR. Such work product which qualifies as a "work for hire"
            under the copyright laws of the United States shall be the exclusive
            property of LICENSOR as "work for hire". All right, title, and
            interest, including any copyright in and to any written data which
            does not qualify as a "work-for-hire" shall be deemed to have been
            automatically transferred to LICENSOR from the date of inception
            thereof. Upon LICENSOR's request, LICENSEE shall execute any
            document and render such other assistance as reasonably necessary to
            perfect full right, title, and interest worldwide in the written
            data, including formal conveyance of copyright. Written data shall
            not be published or submitted for publication by LICENSEE without
            the prior written approval of LICENSOR. Further, if any such
            article, paper, treatise, or report includes work previously
            copyrighted by LICENSEE, LICENSEE hereby grants to LICENSOR a
            nonexclusive, worldwide, irrevocable, paid-up license under such
            copyrights to reproduce, distribute, and use the works in any
            manner.

            During the period of this Agreement and thereafter at any reasonable
            time when called upon to do so by LICENSOR, LICENSEE shall execute
            patent applications, assignments to LICENSOR, and other papers and
            shall render such other assistance that LICENSOR believes necessary
            to secure for LICENSOR the full protection and ownership of all
            rights in and to the work product of the services performed by
            LICENSEE. The filing of patent applications on inventions made by
            LICENSEE shall be decided by LICENSOR and shall be for such
            countries as LICENSOR shall elect. LICENSOR shall bear all the
            expenses in connection with the preparation, filing, and prosecution
            of applications for patents and for all matters provided in this
            subparagraph requiring the time and/or assistance of LICENSEE as to
            inventions. Further, LICENSOR shall pay LICENSEE the hourly rate of
            $ 75.00 for services which LICENSEE performs in connection with
            inventions and patent applications which may be required by LICENSOR
            whether during the term of this Agreement or after expiration or
            termination of this Agreement. LICENSEE warrants that the
            engineering design, manufacturing design, the generation and copying
            of the Documentation and any future updates thereto shall not
            violate any third party's intellectual property rights nor include
            any unauthorized disclosure of any third party's intellectual
            property and agrees to, at its sole expense, at all times during the
            term of this Agreement and thereafter indemnify, defend, and hold
            LICENSOR, their trustees, officers, employees and affiliates
            harmless against any and all costs and/or liabilities of whatever
            nature that may result from any claim by any third party for
            infringement of such third party's intellectual property rights. The
            aforementioned documentation deemed "work for hire" shall be clearly
            marked as the property and proprietary information of LICENSOR.

                                  Page 6 of 14

 
      (B.2) LICENSOR shall pay LICENSEE an amount equal to $ 61,000.00
            (Sixty-one Thousand Dollars) for production tooling required by
            LICENSEE or LICENSEE's subcontractors to produce the Licensed
            Product. The fee hereinabove to be paid by LICENSOR to LICENSEE will
            include full compensation for all engineering design and
            manufacturing for production tooling required by LICENSEE or
            LICENSEE's subcontractors and any future updates thereto as and when
            initiated by LICENSEE to produce the Licensed Product. Issuance of
            an Invoice with Net 30 payment terms for, and the payment of, said
            fee is contingent on 1) the successful completion of testing to the
            satisfaction of LICENSOR and LICENSEE of Licensed Product
            manufactured using the production tooling to be tested to a mutually
            agreed upon set of performance specifications documented in Appendix
            B attached hereto and made a part hereof and 2) delivery to LICENSOR
            by LICENSEE of a complete and accurate listing of such production
            tooling with values per individual item, the extended total of which
            shall equal said fee, and the physical location address for each
            individual item. Title to such production tooling shall vest in
            LICENSOR upon payment of such invoice. LICENSOR shall have complete
            and unhindered access to such production tooling at all times.
            LICENSEE shall be responsible for maintenance and replacement of
            such production tooling as long as LICENSEE derives benefit from its
            use or until such time as LICENSOR shall take physical possession of
            it.

      (C)   LICENSEE shall manufacture the Licensed Product to the
            specifications agreed to for the use of LICENSOR and all other
            customers that may have a need for this product regardless of these
            other customers competitive position with LICENSOR.

      (D)   In consideration of granting said exclusive license to LICENSEE,
            LICENSEE will provide most favored customer status to LICENSOR with
            respect to any selling price and delivery of the Licensed Product to
            LICENSOR. NO ROYALTIES ARE DUE LICENSOR ON THE VALUE OF PRODUCTS
            SOLD TO LICENSOR. At all times that this license is exclusive to
            LICENSEE, LICENSOR will not compete with LICENSEE in the Licensed
            Product as an saleable end-item.

      (E)   LICENSEE is free to set the unit sales price of the Licensed Product
            to any LICENSEE customer. The foregoing notwithstanding and by way
            of indication of most favored customer status of LICENSOR, the Net
            Selling Price of such unit sales price to any third party will not
            be lower at any time than the actual gross selling price to LICENSOR
            for like or lesser quantity purchase commitment.

      (F)   For all sales of the Licensed Product to any organization or entity
            other than LICENSOR, LICENSEE shall pay to LICENSOR running
            Royalties in the amount of five and one half percent (5.5 %) of the
            Net Selling Price plus $ 2.20 per unit for each Commercial Sale of
            Licensed Products by LICENSEE for the first 100,000 units sold by
            LICENSEE to a third party and ten percent (10.0 %) of the Net
            Selling Price only thereafter for each Commercial Sale of Licensed
            Products by LICENSEE, said Royalty to be due and payable upon
            delivery of the report due pursuant to Paragraph 4.5 hereof. In the
            event a Commercial Sale of Licensed Products occurs together with
            the sale or 

                                  Page 7 of 14

 
            lease of a system or other product, (a) such royalty shall be
            calculated solely on the Licensed Product, as no royalty shall be
            payable with respect to any other portion of such system or product;
            and (b) in the event the Net Selling Price of the Licensed Product
            is not separately stated, the royalty shall be calculated based upon
            the Net Selling Price from the most recent prior comparable
            Commercial Sale of a separate Licensed Product.

4.2   No multiple royalties shall be payable solely for the reason that any
      Licensed Products, its manufacture, use, or sale are or shall be covered
      by more than one patent application, patent or certificate of registration
      licensed under this Agreement.

4.3   Royalty payments shall be paid in United States dollars in Houston, Texas,
      or at such other place as LICENSOR may reasonably designate.

4.4   LICENSEE shall keep full, true and accurate books of account and records
      containing all particulars that may be necessary for the purposes of
      showing the amounts payable to or by LICENSOR hereunder. Said books of
      account shall be kept at LICENSEE's principal place of business or the
      principal place of business of the appropriate division of LICENSEE to
      which this Agreement relates. Said books and the supporting data shall be
      open at all reasonable times for three (3) years following the end of the
      calendar year to which they pertain, to the inspection of independent
      CPA's to be proposed by LICENSOR and approved by LICENSEE, said approval
      not to be unreasonably withheld, for the purpose of verifying LICENSEE's
      royalty statement or compliance in other respects with this Agreement,
      such inspection to occur no more than once each calendar year upon
      reasonable prior notice to LICENSEE. The expense of such inspection shall
      be borne by LICENSOR unless such inspection reveals a shortfall in
      payments due to LICENSOR by LICENSEE or other violation of the terms and
      conditions of this Agreement by LICENSEE in which case such expenses shall
      be borne by LICENSEE.

4.5   The Royalty provided in Paragraph 4.1(F) shall be payable to LICENSOR
      within in one (1) month after the end of each calendar quarter. LICENSEE
      shall have the option of paying any portions of the royalty herein
      provided at any time earlier than that specified. Each royalty payment to
      LICENSOR shall include an appropriate statement of the gross revenues due
      LICENSOR and shall identify the portion(s) of the Agreement under which
      said royalty payments are made. In addition, each royalty payment shall be
      accompanied by true and accurate reports giving such particulars of the
      business conducted by LICENSEE during the period to which such payment
      applies under this Agreement ending thirty (30) days prior to such payment
      date as shall be pertinent to an accounting hereunder.

4.6   The royalty payments set forth in this Agreement shall, if overdue, bear
      interest until payment at the maximum per annum rate permitted by
      applicable law. The payment of such interest shall not foreclose LICENSOR
      from exercising any other rights it may have as a consequence of the
      lateness of any payment.

                                  Page 8 of 14

 
ARTICLE. V - INFRINGEMENT
- -------------------------

5.1   Enforcement of Patent Rights. In the event LICENSEE alleges that a third
      ----------------------------
      party is infringing a right contained within Proprietary Rights, LICENSEE
      shall immediately notify LICENSOR of said alleged infringement. LICENSOR
      shall, in its sole discretion, determine whether an infringement is
      occurring and shall take whatever actions it deems necessary to enforce
      Proprietary rights. LICENSOR shall, within thirty (30) days after notice
      thereof, inform LICENSEE how and to what extent it is pursuing such third
      party. In the event LICENSEE deems such action to be insufficient,
      LICENSEE shall have, with LICENSOR's prior written consent signed by an
      officer of LICENSOR, such consent not to be unreasonably withheld, the
      right, in LICENSOR's name, to pursue such infringer, as LICENSEE may
      reasonably deem appropriate; provided, however, that in the event LICENSEE
      takes such action in LICENSOR's name, it shall provide LICENSOR prior
      written notice thereof, shall keep LICENSOR fully informed of the progress
      thereof and shall act in a reasonable manner at all times in connection
      with the prosecution thereof. In the event LICENSOR recovers any amounts
      from such third party as a result of any action taken by LICENSOR,
      LICENSOR shall deduct therefrom the out-of-pocket legal and related
      expenses LICENSOR incurred in obtaining such amount, retain a percentage
      of the remainder equal to the percentage that the royalty fee
      hereinprovided is of the then current Net Selling Price and remit the rest
      to LICENSEE. In the event LICENSEE recovers any amounts from such third
      party as result of any action taken by LICENSEE, such amounts shall be
      treated as a Net Selling Price hereunder, provided that LICENSEE shall
      deduct therefrom the out-of-pocket legal and related expenses it incurred
      in obtaining such amounts prior to paying Royalties thereon. LICENSOR may
      bring and prosecute suits for infringement against others under the
      Proprietary Rights. LICENSOR shall retain whatever financial recoveries
      are obtained from said litigation and shall bear all the expenses of the
      litigation.

5.2   Prosecution of Patents. LICENSOR shall, at its sole discretion and
      ----------------------
      expense, diligently prosecute any patent applications included within
      Proprietary Rights.

5.3   Third Party Actions. In the event a third party at any time brings a claim
      -------------------
      against LICENSEE alleging that LICENSEE's exercise of the Proprietary
      Rights infringe any rights of such third party, LICENSOR shall, with the
      reasonable cooperation of LICENSEE, defend LICENSEE against such claim at
      the expense of LICENSOR and LICENSOR shall pay any settlement amount or
      the damages that a court of competent jurisdiction awards, plus any other
      costs and expenses incurred by LICENSEE in connection therewith provided
      LICENSEE shall a) promptly notify LICENSOR in writing of any such claim,
      b) allow LICENSOR to control such defense and any related settlement
      negotiation, and c) cooperate with LICENSOR in the defense of any such
      claim or any related settlement negotiations.

ARTICLE VI - LIABILITY AND INSURANCE
- ------------------------------------

6.1   LICENSEE, at its sole expense, shall at all times during the term of this
      Agreement and thereafter indemnify, defend, and hold LICENSOR, their
      trustees, officers, employees and affiliates harmless against any claims,
      liabilities, judgments and expenses arising out of the 

                                  Page 9 of 14

 
      death of or injury to any person or persons or out of any damage to
      property and against any other claim of any kind resulting from the
      production, manufacture, sale, advertising, distributing, use, sale or
      transfer of Licensed Products or Licensed Processes pursuant to this
      Agreement. LICENSOR shall give prompt written notice to LICENSEE of any
      matter asserted by LICENSOR to be covered by this Section 6.1. LICENSEE
      shall have the sole right to defend any matter covered by this Section
      6.1.

6.2   EXCEPT AS OTHERWISE EXPRESSLY SET FORTH IN THIS AGREEMENT, LICENSOR MAKES
      NO REPRESENTATIONS AND EXTENDS NO WARRANTIES OF ANY KIND, EITHER EXPRESSED
      OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY,
      FITNESS FOR A PARTICULAR PURPOSE, AND VALIDITY OR NON-INFRINGEMENT OF
      PATENT RIGHT CLAIMS WHICH ARE ISSUED OR PENDING. LICENSOR represents that
      LICENSOR is not aware of any patent right claims pending with respect to
      LICENSOR's Proprietary Rights as of the effective date of this Agreement.

6.3   The only rights being granted pursuant to this Agreement are those
      specifically set forth in Article II herein and this Agreement is not to
      be construed or implied in any way to create any additional rights, or
      options to any rights with regard to the licensing of Proprietary Rights.
      LICENSEE shall keep in confidence and secrecy not only the subject matter
      of the rights herein conveyed, but also such trade secrets, confidential
      information, know-how, and other information relating thereto as it
      relates to the present Proprietary Rights. LICENSOR shall keep in
      confidence and secrecy LICENSEE's trade secrets, confidential information,
      know-how, and other information relating thereto, including without
      limitation, LICENSEE's proprietary technical information pertaining to
      LICENSEE's existing manufacturing processes and know-how. LICENSEE and
      LICENSOR hereby covenant to maintain the other's confidential and
      proprietary information in secrecy. The parties further agree that but for
      the representations of the parties that such information is received in
      confidence and will be maintained in confidence, the present Agreement
      would not have been entered into. Each party is free to use the
      information conveyed hereunder and such future information as is conveyed
      by the other party during the life of the present Agreement subject to the
      provisions hereof and after expiration of the present Proprietary Rights,
      should this Agreement remain in force until such time. However, should
      this Agreement be terminated for any reason, then each party shall be
      forbidden from using the trade secrets, confidential information and other
      proprietary information of the other party for ten (10) years after such
      termination, except for such information as contained in Licensed Process
      and Documentation and except as otherwise provided in Paragraph 2.1
      hereof.

6.4   LICENSEE agrees it has obtained liability insurance with coverage in an
      amount no less than $1,000,000.00 per occurrence. Adequate evidence, such
      as a Certificate of Insurance, of the required coverage will be provided
      by LICENSEE to LICENSOR's Manager of Purchasing, 17200 Park Row, Houston,
      Texas 77084 and LICENSEE agrees to keep said office of LICENSOR informed
      of any changes in coverage or carriers.

                                 Page 10 of 14

 
ARTICLE VII - USE OF NAMES
- --------------------------

7.1   LICENSEE shall be free to use the name of LICENSOR in any advertising,
      promotional or sales literature, provided that, in each case, LICENSEE has
      obtained the prior written consent of an officer of LICENSOR, except that
      LICENSEE may state that it is licensed by LICENSOR under one or more of
      the patents and/or applications comprising the Proprietary Rights.
      LICENSOR shall be free to use the name of LICENSEE, provided that, for
      each such use, LICENSOR has obtained the prior written consent of
      LICENSEE.

ARTICLE VIII -ASSIGNMENT
- ------------------------

8.1   Except as provided below, this Agreement is not assignable and any attempt
      to do so shall be void.

8.2   This Agreement is made subject of the condition LICENSEE shall not become
      bankrupt, insolvent or placed in the hands of a receiver or trustee, in
      which event LICENSOR may, at its option, cancel this Agreement provided
      that all sums of money owing to LICENSOR and all affirmative duties and
      obligations hereunder shall survive such cancellation. If LICENSOR does
      not so cancel this Agreement, this Agreement shall bind the heirs,
      assigns, successors in interest, trustees, devises, executors and
      administrators of the parties hereto in the same manner as is binding on
      the signatory parties hereto.

8.3   LICENSEE may not transfer the present License except:

         a)  LICENSEE transfers substantially all its assets, and
         b)  LICENSEE shall advise LICENSOR at least thirty (30) days in advance
             of any such contemplated transfer, and
         c)  LICENSEE shall provide the identity of the prospective transferee,
             and
         d)  LICENSOR, at its sole discretion, is fully satisfied with the
             qualifications of the prospective transferee, and
         e)  The prospective transferee shall agree in writing to be bound
             by the terms and conditions hereof.

ARTICLE IX- PATENT MAINTENANCE
- ------------------------------

9.1   So long as LICENSEE is generating sufficient Royalties hereunder to cover
      the expense to do so, LICENSOR shall diligently maintain the Proprietary
      Rights during the term of this Agreement at its expense.

ARTICLE X - TERMINATION
- -----------------------

10.1  If LICENSEE shall cease a) to carry on its business, or b) to produce
      Licensed Product, or c) to maintain competitive market pricing for
      Licensed Product, this Agreement shall subject to immediate termination at
      the sole discretion of LICENSOR.

                                 Page 11 of 14

 
10.2  Upon any material breach or default of this Agreement by LICENSEE,
      LICENSOR shall have the right to terminate this Agreement and the rights,
      privileges and license granted hereunder by forty-five (45) days' notice
      to LICENSEE. Such termination shall become immediately effective upon the
      expiration of said forty-five (45) day period, unless LICENSEE a) shall
      have cured any such breach or default prior thereto, b) shall have been
      granted a definite extension of such cure period in writing by LICENSOR,
      or c) has demanded resolution under Article XI prior thereto.

10.3  LICENSEE shall have the right to terminate this Agreement at any time
      after three (3) years on three (3) months' written notice to LICENSOR and
      upon payment of all amounts due LICENSOR through the effective date of the
      termination.

10.4  Termination under this Article, or any other termination provision
      elsewhere expressed in this Agreement, shall not relieve LICENSEE of its
      obligation to pay royalties due and owing at the time of said termination
      or as otherwise due and owing under this Agreement. Termination of this
      Agreement shall not relieve either party of any obligation which this
      Agreement expressly provides shall survive termination of this Agreement
      for any reason.

10.5  In the event of termination of this Agreement for any reason other than
      default hereunder by LICENSEE, and should such termination occur before
      the termination of the Proprietary Rights and thereby place LICENSEE in a
      position of holding Licensed Product built in accordance with or pursuant
      to the Proprietary Rights wherein LICENSEE would be unable to sell such
      Licensed Product, in that event, LICENSOR shall be obligated to purchase
      such inventory at a price to be mutually agreed, but not to exceed the
      cost thereof plus twenty percent (20%).

ARTICLE XI - ARBITRATION
- ------------------------

11.1  BINDING ARBITRATION. ALL CONTROVERSIES AND/OR DISPUTES ARISING OUT OF THIS
      -------------------
      AGREEMENT SHALL BE DECIDED BY THREE (3) ARBITRATORS. WRITTEN NOTICE OF ANY
      DISPUTE SHALL BE GIVEN BY THE AGGRIEVED PARTY, CLEARLY SPECIFYING THE
      NATURE OF THE DISPUTE AND THE RELIEF REQUESTED, INCLUDING THE PARAGRAPH OF
      THIS AGREEMENT IN QUESTION, IF ANY. IF THE DISPUTE CANNOT BE AMICABLY
      RESOLVED (EVIDENCED BY WRITING SIGNED BY BOTH PARTIES) WITHIN THIRTY (30)
      DAYS OF SUCH NOTICE, EITHER PARTY MAY SERVE THE OTHER WITH A WRITTEN
      DEMAND FOR ARBITRATION PURSUANT TO THIS ARTICLE. WHERE LICENSEE HAS
      DEMANDED THE ARBITRATION UNDER PARAGRAPH 10.2, THE THIRTY (30) DAY PERIOD
      IN THE FOREGOING SENTENCE SHALL BE INAPPLICABLE.

11.2  Procedure
      ---------

11.2.1 Each party shall be responsible for one half of the cost of the
       arbitrators. The arbitrators shall be selected as follows;

                                 Page 12 of 14

 
       11.2.1.1 The party demanding arbitration shall, together with its demand
                 for arbitration, submit the name of one arbitrator.

       11.2.1.2 Within twenty (20) calendar days thereafter the party receiving
                such demand shall respond with the name of an additional 
                arbitrator.

       11.2.1.3 The two arbitrators so selected shall, within twenty (20)
                calendar days after the selection of the second arbitrator, 
                select a third arbitrator. Failure of the two arbitrators so 
                selected to select a third arbitrator shall be referred to the 
                American Arbitration Association for immediate resolution.

11.2.2 All pre-hearing, hearing, and post-hearing procedures shall be governed
       by the Commercial Arbitration Rules of the American Arbitration
       Association then in effect, except as modified by this Agreement.

11.2.3 The site of the arbitration proceedings pursuant to this Article shall be
       Boston, Massachusetts if commenced by LICENSOR and Houston, Texas if
       commenced by LICENSEE.

11.2.4 All decisions of the arbitrators shall be by majority vote. The
       arbitrators shall be bound to make specific findings of fact and reach
       conclusions of law, based upon the submissions and evidence of the
       parties. and shall issue a written decision explaining the basis for the
       decision and award. Proceedings shall be concluded within sixty (60) days
       of the date the third arbitrator is selected.

11.3  Court Actions During the pendency of any proceeding under Section 11.1 or
      -------------
      11.2, neither party will commence any litigation relating to any dispute
      under this Agreement and any litigation commenced prior to commencement of
      any proceeding under Sections 11.1 or 11.2 shall be stayed pending the
      outcome thereof. The parties agree to fully abide by the terms of any
      arbitration award hereunder as final and binding. Judgment upon any award
      may be entered and enforced by either party in any court of competent
      jurisdiction.

ARTICLE XII - MISCELLANEOUS PROVISIONS
- --------------------------------------

12.1  This Agreement shall be construed, governed, interpreted and applied in
      accordance with the laws of the State of Texas.

12.2  The parties hereto acknowledge that this Agreement sets forth the entire
      agreement and understanding of parties hereto as to the subject matter
      hereof, and shall not be subject to any change or modification except by
      the execution of a written instrument subscribed to by the parties hereto.

12.3  Whenever possible each provision of this Agreement shall be interpreted in
      the same manner as to be effected and valid under applicable law. The
      provisions of this Agreement, other than Article II, are severable, and in
      the event that any provisions of this Agreement shall be determined to be
      invalid or unenforceable under any controlling body of the law, such

                                 Page 13 of 14

 
      invalidity or unenforceability shall not in any way affect the validity or
      enforceability of the remaining provisions hereof.

12.4  LICENSEE agrees to mark the Licensed Products as Patented for all products
      shipped from any location of manufacture.

12.5  The failure of either party to assert a right hereunder or to insist upon
      compliance with any term or condition of this Agreement shall not
      constitute a waiver of that right or any other right hereunder and shall
      not excuse a similar subsequent failure to perform any such term or
      condition by the other party.

12.6  All notices and correspondence provided for herein shall be given by
      depositing same in the United States Mail, first class postage prepaid,
      mailed to the following addresses:

                                               
      If to LICENSOR:                         If to LICENSEE:
         Syntron, Inc.                           Benthos, Inc.
         Attention:  Manager of Purchasing       Attention:  President
         17200 Park Row                          49 Edgerton Drive
         Houston, TX  77084-4925                 North Falmouth, MA  02556-2826


      The above addresses are the registered offices of the parties. Changes in
      address shall be given by utilizing the notice provisions of this
      paragraph.

12.7  This Agreement may be executed in one or more counterparts, each of which
      shall be deemed an original, but all of which together shall constitute
      one and the same instrument.

12.8  No provision of this Agreement shall be construed or be deemed to create a
      joint venture or partnership or establish the relationship of principal
      and agent between LICENSOR and LICENSEE. The relationship of LICENSOR and
      LICENSEE shall at all times be that of licensor and licensee, neither
      party being empowered to act on behalf of the other except to the extent
      expressly authorized herein.


IN WITNESS THEREOF, the parties have hereunto set their hands and seals and duly
executed this Agreement the day and year set forth below,

SYNTRON, INC.                               BENTHOS, INC.
                                        
By: /s/ BRUCE  NELSON                       By: /s/ JOHN L. COUGHLIN
    --------------------------                  --------------------------
    Name:  BRUCE NELSON                         Name: JOHN L. COUGHLIN
    Title:  President                           Title:  President/CEO

Date:  3 Nov  97                            Date:   10/21/97
      -----------                                 -----------

                                 Page 14 of 14