EXHIBIT 10.13 BENTHOS, INC. 1998 NON-EMPLOYEE DIRECTORS' STOCK OPTION PLAN The purposes of the Benthos, Inc. 1998 Non-Employee Directors' Stock Option Plan (the "Plan") are to promote the long-term success of Benthos, Inc. ("Benthos") by creating a long-term mutuality of interests between the non- employee Directors and stockholders of Benthos, to provide an additional inducement for such directors to remain with Benthos and to provide a means through which Benthos may attract able persons to serve as directors of Benthos. SECTION 1 Administration The Plan shall be administered by a Committee (the "Committee") appointed by the Board of Directors of Benthos (the "Board") and consisting of not less than two members of the Board. The Committee shall keep records of action taken at its meetings. A majority of the Committee shall constitute a quorum at any meeting, and the acts of a majority of the members present at any meeting at which a quorum is present, or acts approved in writing by all the members of the Committee, shall be the acts of the Committee. At all times this membership of the Committee shall always satisfy the requirements of Rule 16b-3 under the Securities Exchange Act of 1934 (the "1934 Act") or any successor rule. The Committee shall interpret the Plan and prescribe such rules, regulations and procedures in connection with the operations of the Plan as it shall deem to be necessary and advisable for the administration of the Plan consistent with the purposes of the Plan. All questions of interpretation and application of the Plan, or as to stock options granted under the Plan, shall be subject to the determination of the Committee, which shall be final and binding. Notwithstanding the above, the selection of the directors to whom stock options are to be granted, the timing of such grants, the number of shares subject to any stock option, the exercise price of any stock option, the periods during which any stock option may be exercised and the term of any stock option shall be determined by the Board as hereinafter provided, and the Committee shall have no discretion as to such matters. SECTION 2 Shares Available Under the Plan The aggregate number of shares which may be issued and as to which grants of stock options may be made under the Plan is 150,000 shares of the common stock, par value $.0667 per share, of Benthos (the "Common Stock"), subject to adjustment and substitution as set forth in Section 5. If any stock option granted under the Plan is canceled by mutual consent or terminates or expires for any reason without having been exercised in full, the number of shares subject thereto shall again be available for purposes of the Plan. The shares which may be issued under the Plan may be either authorized but unissued shares or treasury shares or partly each. SECTION 3 Grant of Stock Options Options to purchase shares of Common Stock shall be granted under the Plan as follows: (i) immediately following the initial election of any new director of Benthos who is not otherwise an employee of Benthos, or any subsidiary of Benthos (a "non-employee Director"), an option shall be granted to such new non- employee Director for the purchase of Fifteen Thousand (15,000) shares of Common Stock, and (ii) from time to time thereafter such additional options to purchase shares of Common Stock as the Board in its sole discretion shall determine, shall be granted to non-employee Directors. All options granted pursuant to this Plan shall be "nonstatutory stock options" (i.e., stock options which do not qualify under Sections 422 or 423 of the Internal Revenue Code of 1986, as amended (the "Code"). SECTION 4 Terms and Conditions of Stock Options Stock options granted under the Plan shall be subject to the following terms and conditions: (A) The purchase price at which each stock option may be exercised (the "option price") shall be one hundred percent (100%) of the fair market value per share of the Common Stock covered by the stock option on the date of grant, determined as provided in Section 4(G). (B) The option price for each stock option shall be paid in full upon exercise and shall be payable in cash in United States dollars (including check, bank draft or money order); provided, however, that in lieu of such cash the person exercising the stock option may pay the option price in whole or in part by delivering to Benthos shares of Common Stock having a fair market value on the date of exercise of the stock option, determined as provided in Section 4(G), equal to the option price for the shares being purchased; except that (i) any portion of the option price representing a fraction of a share shall in any event be paid in cash and (ii) no shares of Common Stock which have been held for less than six months may be delivered in payment of the option price of a stock option. Delivery of shares may also be accomplished through the effective transfer to Benthos of shares of Common Stock held by a broker or other agent. Benthos will also cooperate with any person exercising a stock option who participates in a cashless exercise program of a broker or other agent under which all or part of the shares received upon exercise of the stock option are sold through the broker or other agent or under which the broker or other agent makes a loan to such person. Notwithstanding the foregoing, the exercise of the stock option shall not be deemed to occur and no shares of Common Stock will be issued by Benthos upon exercise of the stock option until Benthos has received payment of the option price in full. 2 The date of exercise of a stock option shall be determined under procedures established by the Committee, and as of the date of exercise the person exercising the stock option shall be considered for all purposes to be the owner of the shares with respect to which the stock option has been exercised. Payment of the option price with shares of Benthos shall not increase the number of shares of the Common Stock which may be issued under the Plan as provided in Section 2. (C) No stock option granted hereunder shall be exercisable during the first year of its term, except in the event of death as provided in Section 4(E) or in the event of a Section 6 Event as provided in Section 6. Thereafter, the options shall be exercisable as follows: after one year from the date of grant, the option may be exercised for one-third of the option shares, after two years from the date of grant, the option may be exercised for two-thirds of the option shares, and after three years from the date of grant, the option may be exercised for all of the option shares. Subject to the preceding sentence and subject to Section 4(E) which provides for earlier termination of a stock option under certain circumstances, each stock option shall be exercisable for ten years from the date of grant. A stock option to the extent exercisable may be exercised in whole or in part. (D) No stock option shall be transferable by the grantee otherwise than by will, or if the grantee dies intestate, by the laws of descent and distribution of the state of domicile of the grantee at the time of death. All stock options shall be exercisable during the lifetime of the grantee only by the grantee or the grantee's guardian or legal representative. (E) If a grantee ceases to be a director of Benthos for any reason, any outstanding stock options held by the grantee shall be exercisable according to the following provisions: (i) If a grantee ceases to be a director of Benthos for any reason other than resignation, removal for cause or death, any outstanding stock option held by such grantee shall be exercisable by the grantee (but only if exercisable by the grantee immediately prior to ceasing to be a director) at any time prior to the expiration date of such stock option or within one year after the date the grantee ceases to be a director, whichever is the shorter period; (ii) If during his term of office as a director a grantee resigns from the Board or is removed from office for cause, any outstanding stock option held by the grantee which is not exercisable by the grantee immediately prior to resignation or removal shall terminate as of the date of resignation or removal, and any outstanding stock option held by the grantee which is exercisable by the grantee immediately prior to resignation or removal shall be exercisable by the grantee at any time prior to the expiration date of such stock option or within three months after the date of resignation or removal of the grantee, whichever is the shorter period. 3 (iii) Following the death of a grantee during service as a director of Benthos, any outstanding stock option held by the grantee at the time of death shall be exercisable, to the extent such outstanding stock option would have been exercisable on the next subsequent anniversary date of such option after the death of the grantee, by the person entitled to do so under the will of the grantee, or, if the grantee shall fail to make testamentary disposition of the stock option or shall die intestate, by the legal representative of the grantee at any time prior to the expiration date of such stock option or within one year after the date of death of the grantee, whichever is the shorter period; (iv) Following the death of a grantee after ceasing to be a director and during a period when a stock option is exercisable under clause (i) above, the stock option shall be exercisable by such person entitled to do so under the will of the grantee or by such legal representative at any time prior to the expiration date of the stock option or within one year after the date of death, whichever is the shorter period; and (v) Following the death of a grantee after ceasing to be a director and during a period when a stock option is exercisable under clause (ii) above, the stock option shall be exercisable by such person entitled to do so under the will of the grantee or by such legal representative at any time during the shorter of the following two periods: (i) until the expiration date of the stock option or (ii) until three months after the grantee ceased being a director or one year after the date of death of the grantee (whichever is longer). A stock option held by a grantee who has ceased to be a director of Benthos shall terminate upon the expiration of the applicable exercise period, if any, specified in this Section 4(E). (F) All stock options shall be confirmed by an agreement, or an amendment thereto, which shall be executed on behalf of Benthos by an authorized officer of Benthos and by the grantee. (G) Fair market value of the Common Stock shall be the closing price, as applicable, for the date as of which fair market value is to be determined as quoted in The Wall Street Journal (or in such other reliable publication as the Committee, in its discretion, may determine to reply upon): (i) the closing price per share of Common Stock for such date on (or on any composite index including) the principal United States securities exchange registered under the 1934 Act on which the Common Stock is listed, or (ii) if the Common Stock is not listed on any such exchange, the closing price per share of the Common Stock for such date on the Nasdaq National Market or SmallCap Market or any successor system then in use ("Nasdaq"). If there are no such sale price quotations for the date as of which fair market value is to be determined but there are such sale price quotations within a reasonable period before such date, then fair market value shall be the 4 closing price per share of Common Stock on the closest date prior to the date on which the fair market value is to be determined. If the fair market value of the Common Stock cannot be determined on the basis previously set forth in this Section 4(G) for the date as of which fair market value is to be determined, the Committee shall in good faith determine the fair market value of the Common Stock on such date. Fair market value shall be determined without regard to any restriction other than a restriction which, by its terms, will never lapse. (H) The obligation of Benthos to issue shares of the Common Stock under the Plan shall be subject to (i) the effectiveness of a registration statement under the Securities Act of 1933, as amended, with respect to such shares, if deemed necessary or appropriate by counsel for Benthos, (ii) the condition that the shares shall have been listed (or authorized for listing upon official notice of issuance) upon each stock exchange, if any, on which the Common Stock may then be listed and (iii) all other applicable laws, regulations, rules and orders which may then be in effect. Subject to the foregoing provisions of this Section 4 and other provisions of the Plan, any stock option granted under the Plan shall be subject to such restrictions and other terms and conditions, if any, as shall be determined, in its discretion, by the Board and set forth in the agreement referred to in Section 4(F), or an amendment thereto; except that in no event shall the Committee or the Board have any power or authority which would case the Plan to fail to be a plan described in Rule 16b-3(d)(1), or any successor rule. SECTION 5 Adjustment and Substitution of Shares If a dividend or other distribution shall be declared upon the Common Stock payable in shares of the Common Stock, the number of shares of the Common Stock set forth in Section 3, the number of shares of the Common Stock then subject to any outstanding stock options and the number of shares of the Common Stock which may be issued under the Plan but are not then subject to outstanding stock options on the date fixed for determining the stockholders entitled to receive such stock dividend or distribution shall be adjusted by adding thereto the number of shares of the Common Stock which would have been distributable thereon if such shares had been outstanding on such date. If the outstanding shares of the Common Stock shall be changed into or exchangeable for a different number or kind of shares of stock or other securities of Benthos or another corporation, whether through reorganization, reclassification, recapitalization, stock split-up, combination of shares, merger or consolidation, then there shall be substituted for each share of the Common Stock set forth in Section 3, for each share of the Common Stock subject to any then outstanding stock option and for each share of the Common Stock which may be issued under the Plan but which is not then subject to any outstanding stock option, the number and kind of shares of stock or other securities into which each outstanding share of the Common Stock shall be so changed or for which each such share shall be exchangeable. 5 In case of any adjustment or substitution as provided for in the first two paragraphs of this Section 5, the aggregate option price for all shares subject to each then outstanding stock option prior to such adjustment or substitution shall be the aggregate option price for all shares of stock or other securities (including any fraction) to which such shares shall have been adjusted or which shall have been substituted for such shares. Any new option price per share shall be carried to at least three decimal places with the last decimal place rounded upwards to the nearest whole number. If the outstanding shares of the Common Stock shall be changed in value by reason of any spin-off, split-off or split-up, or dividend in partial liquidation, dividend in property other than cash or extraordinary distribution to holders of the Common Stock, the Committee shall make any adjustments to any then outstanding stock option which it determines are equitably required to prevent dilution or enlargement of the rights of grantees which would otherwise result from any such transaction. No adjustment or substitution provided for in this Section 5 shall require Benthos to issue or sell a fraction of a share or other security. Accordingly, all fractional shares or other securities which result from any such adjustment or substitution shall be eliminated and not carried forward to any subsequent adjustment or substitution. Except as provided in this Section 5, grantee shall have no rights by reason of any issue by Benthos of stock of any class or securities convertible into stock of any class, any subdivision or consolidation of shares of stock of any class, the payment of any stock dividend or any other increase or decrease in the number of shares of stock of any class. SECTION 6 Additional Rights in Certain Events (A) Definitions. For purposes of this Section 6, the following terms shall have the following meanings: (1) The term "Person" shall be used as that term is used in Sections 13(d) and 14(d) of the 1934 Act as in effect on the effective date of the Plan. (2) "Beneficial Ownership" shall be determined as provided in Rule 13d-3 under the 1934 Act as in effect on the effective date of the Plan. (3) A specified percentage of "Voting Power" of a company shall mean such number of the Voting Shares as shall enable the holders thereof to cast such percentage of all the votes which could be cast in an annual election of directors (without consideration of the rights of any class of stock other than the common stock of the company to elect directors by a separate class 6 vote); and "Voting Shares" shall mean all securities of a company entitling the holders thereof to vote in an annual election of directors (without consideration of the rights of any class of stock other than the common stock of the company to elect directors by a separate class vote). (4) "Tender Offer" shall mean a tender offer or exchange offer to acquire securities of Benthos (other than such an offer made by Benthos or any Subsidiary), whether or not such offer is approved or opposed by the Board. (5) "Continuing Directors" shall mean a director of Benthos who either (a) was a director of Benthos on the effective date of the Plan or (b) is an individual whose election, or nomination for election, as a director of Benthos was approved by a vote of at least two-thirds of the directors then still in office who were Continuing Directors (other than an individual whose initial assumption of office is in connection with an actual or threatened election contest relating to the election of directors of Benthos which would be subject to Rule 14a-11 under the 1934 Act, or any successor Rule). (6) "Section 6 Event" shall mean the date upon which any of the following events occurs: (a) Benthos acquires actual knowledge that any Person other than Benthos, a Subsidiary or any employee benefit plan(s) sponsored by Benthos or a Subsidiary has acquired the Beneficial Ownership, directly or indirectly, of securities of Benthos entitling such Person to 30% or more of the Voting Power of Benthos; (b) A Tender Offer is made to acquire securities of Benthos entitling the holders thereof to 30% or more of the Voting Power of Benthos; or (c) A solicitation subject to Rule 14a-11 under the 1934 Act (or any successor Rule) relating to the election or removal of 50% or more of the members of the Board or any class of the Board shall be made by any person other than Benthos or less than 51% of the members of the Board shall be Continuing Directors; or (d) The stockholders of Benthos shall approve a merger, consolidation, share exchange, division or sale or other disposition of assets of Benthos as a result of which the stockholders of Benthos immediately prior to such transaction shall not hold, directly or indirectly, immediately following such transaction a majority of the Voting Power of (i) in the case of a merger or consolidation, the surviving or resulting corporation, (ii) in the case of a share exchange, the acquiring corporation or (iii) in the case of a division or sale or other disposition of assets, each surviving, resulting or acquiring corporation which, immediately following the transaction, holds more than 7 10% of the consolidated assets of Benthos immediately prior to the transaction; provided however, that (i) if securities beneficially owned by a grantee are included in determining the Beneficial Ownership of a Person referred to in paragraph 6(a), (ii) a grantee is required to be named pursuant to Item 2 of the Schedule 14D-1 (or any similar successor filing requirement) required to be filed by the bidder making a Tender Offer referred to in paragraph 6(b) or (iii) if a grantee is a "participant" as defined in Instruction 3 to Item 4 of Schedule 14A under the 1934 Act (or any successor rule) in a solicitation (other than a solicitation by Benthos) referred to in paragraph 6(c), then no Section 6 Event with respect to such grantee shall be deemed to have occurred by reason of such event. (B) Acceleration of the Exercise Date of Stock Options. Notwithstanding any other provision contained in the Plan, in case any "Section 6 Event" occurs all outstanding stock options (other than those held by a person referred to in the proviso to Section 6(A)(6)) shall become immediately and fully exercisable whether or not otherwise exercisable by their terms. SECTION 7 Effect of the Plan on the Rights of Corporation and Stockholders Nothing in the Plan, in any stock option granted under the Plan, or in any stock option agreement shall confer any right to any person to continue as a director of Benthos or interfere in any way with the rights of the stockholders of Benthos or the Board to elect and remove directors. SECTION 8 Amendment and Termination The right to amend the Plan at any time and from time to time and the right to terminate the Plan at any time are hereby specifically reserved to the Board, provided always that no such termination shall terminate any outstanding stock options granted under the Plan, and provided further that no amendment of the Plan shall (i) be made without stockholder approval if stockholder approval of the amendment is at the time required for stock options under the Plan by Nasdaq or the rules of any stock exchange on which the Common Stock may then be listed, (ii) amend more than once every six months the provisions of the Plan relating to the selection of the Directors to whom stock options are to be granted, the timing of such grants, the number of shares subject to any stock option, the exercise price of any stock options, the periods during which any stock option may be exercised and the term of any stock option other than to comply with changes in the Code or the rules and regulations thereunder or (iii) otherwise amend the Plan in any manner that would cause stock options under the Plan not to qualify for the exemption provided 8 by Rule 16b-3 under the 1934 Act, or any successor rule. No amendment or termination of the Plan shall, without the written consent of the holder of a stock option therefore awarded under the Plan, adversely affect the rights of such holder with respect thereto. Notwithstanding anything contained in the preceding paragraph or any other provision of the Plan or any stock option agreement, the Board shall have the power to amend the Plan in any manner deemed necessary or advisable for stock options granted under the Plan to qualify for the exemption provided by Rule 16b-3 (or any successor rule relating to exemption from Section 16(b) of the 1934 Act), and any such amendment shall, to the extent deemed necessary or advisable by the Board, be applicable to any outstanding stock options theretofore granted under the Plan notwithstanding any contrary provisions contained in any stock option agreement. In the event of any such amendment to the Plan, the holder of any stock option outstanding under the Plan shall, upon request of the Committee and as a condition to the exercisability of such option, execute a conforming amendment in the form prescribed by the Committee to the stock option agreement referred to in Section 4(F) within such reasonable time as the Committee shall specify in such request. SECTION 9 Effective Date and Duration of Plan The Plan shall become effective upon approval by the affirmative vote of the holders of a majority of the Common Stock present in person or by proxy and entitled to vote at a duly called and convened meeting of such holders. If such approval is obtained at the Special Meeting of Stockholders on April 3, 1998, the Plan shall be effective on the date of such meeting. This Plan shall expire on December 31, 2007. Termination of the Plan shall not, without the consent of the grantee, affect such grantee's rights under any option previously granted to such grantee. 9