EXHIBIT 5

                            SULLIVAN & WORCESTER LLP
                             ONE POST OFFICE SQUARE
                           BOSTON, MASSACHUSETTS 02109
                                 (617) 338-2800
                              FAX NO. 617-338-2880
     IN WASHINGTON, D.C.                                   IN NEW YORK CITY
1025 CONNECTICUT AVENUE, N.W.                              767 THIRD AVENUE
   WASHINGTON, D.C. 20036                              NEW YORK, NEW YORK 10017
       (202) 775-8190                                       (212) 486-8200
    FAX NO. 202-293-2275                                 FAX NO. 212-758-2151




                                January 13, 1998


Iron Mountain Incorporated
745 Atlantic Avenue
Boston, Massachusetts 02111

         Re:      Iron Mountain Incorporated Registration
                  Statement on Form S-3

Ladies and Gentlemen:

         In connection with the  registration by Iron Mountain  Incorporated,  a
Delaware corporation (the "Company"),  of up to $350,000,000 in aggregate amount
of one or  more  series  of (i)  debt  securities  of  the  Company  (the  "Debt
Securities"),  which may be guaranteed (the  "Guarantees") by all of the present
and future  subsidiaries  of the Company  (the  "Subsidiary  Guarantors"),  (ii)
shares of  preferred  stock,  $.01 par  value per  share,  of the  Company  (the
"Preferred Shares"),  (iii) depositary shares representing  fractional interests
in Preferred  Shares  ("Depositary  Shares")  evidenced by  depositary  receipts
therefor  ("Depositary  Receipts"),  (iv) shares of common stock, $.01 par value
per share,  of the Company  (the "Common  Shares"),  or (v) warrants to purchase
Debt  Securities,  Preferred  Shares,  Depositary  Shares or Common  Shares (the
"Warrants" and,  together with the Debt  Securities,  the Guarantees,  Preferred
Shares, Depositary Shares, and Common Shares, the "Registered Securities"),  for
offering by the Company from time to time, as set forth in the final  prospectus
that  forms  a  part  of the  Registration  Statement,  as  defined  below  (the
"Prospectus"),  and as to be set forth in one or more final  supplements  to the
Prospectus (each, a "Prospectus Supplement"), the following opinion is furnished
to the Company to be filed with the  Securities  and  Exchange  Commission  (the
"Commission") as Exhibit 5 to the Company's  Registration Statement on Form S-3,
under the Securities Act of 1933, as amended (the "Securities Act"), to be filed
on or about the date hereof.  As used in this  opinion,  the term  "Registration
Statement" means,  unless otherwise  stated,  such  Registration  Statement,  as
amended when  declared  effective by the  Commission  (including  any  necessary
post-effective amendments thereto); the term "Convertible Registered Securities"
means  Registered  Securities  which are convertible  into,  exchangeable for or



Iron Mountain Incorporated
January 13, 1998
Page 2

exercisable for other Registered Securities, and the term "Underlying Registered
Securities" means any Registered  Securities which are issuable upon conversion,
exchange or exercise of Convertible Registered Securities.

         In  connection  with this  opinion,  we have examined and relied upon a
copy of the  Registration  Statement to be filed with the Commission on or about
the date hereof.  We have also  examined and relied upon  originals or copies of
such records, agreements and instruments of the Company,  certificates of public
officials  and of officers of the Company and such other  documents and records,
and such matters of law, as we have deemed necessary as a basis for the opinions
hereinafter  expressed.  In  making  such  examination,   we  have  assumed  the
genuineness  of all  signatures,  the legal  capacity  of natural  persons,  the
authenticity of all documents submitted to us as originals and the conformity to
the  originals of all documents  submitted to us as copies,  which facts we have
not independently verified.

         We have necessarily  assumed in connection with the opinions  expressed
below that the terms and conditions of the Registered Securities and any related
indentures,  agreements and  instruments,  except to the extent described in the
Registration Statement and the form of preliminary prospectus contained therein,
as originally  filed,  will be, and that any related  proceedings of the Company
conducted  after the date hereof will be conducted,  (i) in accordance  with all
applicable  laws  and  the  Company's   Amended  and  Restated   Certificate  of
Incorporation  (the "Restated  Certificate")  and Amended and Restated  By-laws,
(ii) in the case of the  Guarantees,  in accordance with all applicable laws and
the Subsidiary  Guarantors'  charters and by-laws, and (ii) not in conflict with
any  contractual  or other  restrictions  which are binding on the Company,  and
that,  without  limiting the  generality  of the  foregoing,  any  agreements or
instruments  that  are  hereafter  required  to be filed  as an  exhibit  to the
Registration  Statement will be properly filed by an amendment thereto or by the
filing of a Form 8-K by the Company under the  Securities  Exchange Act of 1934,
as  amended,  and  properly   incorporated  by  reference  in  the  Registration
Statement,  as permitted by the Securities Act and the rules and  regulations of
the Commission  thereunder.  We have also necessarily assumed in connection with
such  opinions  with  respect to any Common  Shares or  Preferred  Shares or any
Convertible  Registered Securities as to which Common Shares or Preferred Shares
are the  related  Underlying  Registered  Securities  that,  at the  time of the
issuance  thereof,  the  Company  will  have a  sufficient  number  of shares of
authorized  Common  Shares or  Preferred  Shares,  as the case may be, under the
Restated  Certificate  that will be  unissued  and not  otherwise  reserved  for
issuance.

         To the extent that the  obligations of the Company under each Indenture
or any Warrant Agreement or Depositary  Agreement (each as defined below) may be
dependent  upon such matters,  we have assumed for purposes of this opinion that
each Trustee and each Warrant Agent 


Iron Mountain Incorporated
January 13, 1998
Page 3

and Depositary (each as defined below) are duly organized,  validly existing and
in  good  standing  under  the  laws  of  their   respective   jurisdictions  of
organization,  and are duly qualified to engage in the  activities  contemplated
by, and have the  requisite  organizational  and legal  power and  authority  to
perform their respective  obligations  under, each Indenture,  Warrant Agreement
and Depositary Agreement to which they are parties,  that each Trustee,  Warrant
Agent and Depositary will be in compliance,  generally with respect to acting as
a trustee or agent  under  each  applicable  Indenture,  Warrant  Agreement  and
Depositary  Agreement,  with all applicable laws and regulations,  and that each
Indenture and any Warrant  Agreement and Depositary  Agreement will be the valid
and binding  agreements  of each party  thereto  (other than,  in the case of an
indenture in the form filed as Exhibit 4.1 or 4.2 to the Registration  Statement
when appropriately completed, the Company),  enforceable against such parties in
accordance with their respective terms.

         We express no opinion herein as to the laws of any  jurisdiction  other
than  the  laws of The  Commonwealth  of  Massachusetts,  the  Delaware  General
Corporation  Law and the federal  laws of the United  States of America,  and we
express no opinion as to state securities or blue sky laws.

         Our  opinions  set forth below with  respect to the validity or binding
effect of any  security or  obligation  are subject to (i)  limitations  arising
under applicable bankruptcy, insolvency, reorganization,  fraudulent conveyance,
moratorium or other  similar laws  affecting  the  enforcement  generally of the
rights and  remedies of  creditors  and secured  parties or the  obligations  of
debtors,  (ii) general principles of equity (regardless of whether considered in
a proceeding at law or in equity), including, without limitation, the discretion
of any court of  competent  jurisdiction  in granting  specific  performance  or
injunctive or other equitable  relief,  and (iii) an implied duty on the part of
the  party  seeking  to  enforce  rights or  remedies  to take  action  and make
determinations on a reasonable basis and in good faith to the extent required by
applicable law.

         Based on and subject to the  foregoing,  we are of the opinion that, as
of the date hereof:

                  1. Each series of Debt Securities and the Guarantees,  if any,
         will be validly  issued and binding  obligations of the Company and the
         Subsidiary  Guarantors when (i) the  Registration  Statement shall have
         become  effective under the Securities Act and the indentures  filed as
         Exhibit  4.1  and  4.2 to the  Registration  Statement,  including  any
         necessary supplemental indenture, or any other indenture, including any
         necessary  supplemental  indenture thereto,  filed as an exhibit to the
         Registration  Statement,  as the case may be (the applicable indenture,
         as so  filed  and  supplemented,  the  "Indenture"),  shall  have  been
         qualified  under the Trust  Indenture Act of 1939, as amended,  and the
         Indenture  shall have been duly  authorized,  executed and delivered by
         the Company and a 


Iron Mountain Incorporated
January 13, 1998
Page 4

         trustee named thereunder (the "Trustee"),  (ii) a Prospectus Supplement
         with respect to such Debt Securities and the Guarantees shall have been
         filed with the  Commission  pursuant  to Rule 424 under the  Securities
         Act,  (iii)  the  Company's  Board of  Directors  or a duly  authorized
         committee thereof shall have duly adopted final resolutions (the "Final
         Debt  Resolutions")  authorizing  the  issuance  and sale of such  Debt
         Securities and the Subsidiary Guarantors' Board of Directors shall have
         duly adopted  final  resolutions  (the "Final  Guarantor  Resolutions")
         authorizing  the Guarantees,  each as contemplated by the  Registration
         Statement, the Prospectus, the applicable Prospectus Supplement and the
         Indenture, (iv) such series of Debt Securities shall have been (A) duly
         executed by the Company and authenticated by the Trustee as provided in
         the Indenture and the Final Debt  Resolutions and (B) duly delivered to
         the  purchasers  thereof  against  payment of the agreed  consideration
         therefor,  as provided in the Registration  Statement,  the Prospectus,
         the applicable Prospectus Supplement,  the Indenture and the Final Debt
         Resolutions and (v) the consideration,  if any,  separately payable for
         the  Guarantees   shall  have  been   received,   as  provided  in  the
         Registration  Statement,  the  Prospectus,  the  applicable  Prospectus
         Supplement, the Indenture and the Final Guarantor Resolutions.  If such
         Debt Securities are Underlying Registered  Securities,  the opinion set
         forth in this  paragraph is subject to the further  condition  that the
         Convertible Registered Securities relating to such Debt Securities,  at
         the time of the  issuance  thereof and of the  conversion,  exchange or
         exercise thereof,  are validly issued, fully paid and non-assessable by
         the  Company or are  validly  issued  and  binding  obligations  of the
         Company, as applicable.

                  2. Each series of  Preferred  Shares  will be validly  issued,
         fully paid and  non-assessable by the Company when (i) the Registration
         Statement shall have become  effective under the Securities Act, (ii) a
         Prospectus  Supplement with respect to such Preferred Shares shall have
         been  filed  with  the  Commission  pursuant  to  Rule  424  under  the
         Securities  Act,  (iii)  the  Company's  Board of  Directors  or a duly
         authorized  committee thereof shall have duly adopted final resolutions
         (the "Final Preferred Shares Resolutions") authorizing the issuance and
         sale of such  Preferred  Shares  as  contemplated  by the  Registration
         Statement,  the Prospectus and the  applicable  Prospectus  Supplement,
         (iv) a  Certificate  of  Designation  setting  forth  the terms of such
         series  of  Preferred  Shares,   including  establishing  a  sufficient
         quantity  thereof  and  setting  forth the  preferences,  restrictions,
         limitations as to dividends, qualifications and terms and conditions of
         redemption,  consistent  with the Final Preferred  Shares  Resolutions,
         shall have been duly executed and filed with and accepted for record by
         the Secretary of State of the State of Delaware,  and (v)  certificates
         evidencing  such  Preferred  Shares  shall  have  been  duly  executed,
         countersigned  and  registered  and duly  delivered  to the  purchasers
         thereof  against payment of the agreed  consideration  therefor (and in
         any event an amount at least equal to the par value, if any,  thereof),
         as  provided  in  the  Registration  Statement,  the  


Iron Mountain Incorporated
January 13, 1998
Page 5

         Prospectus,   the  applicable   Prospectus  Supplement  and  the  Final
         Preferred Shares  Resolutions.  If such Preferred Shares are Underlying
         Registered  Securities,  the  opinion  set forth in this  paragraph  is
         subject  to the  further  condition  that  the  Convertible  Registered
         Securities  relating  to  such  Preferred  Shares,  at the  time of the
         issuance thereof and of the conversion,  exchange or exercise  thereof,
         are validly issued, fully paid and non-assessable by the Company or are
         validly issued and binding obligations of the Company, as applicable.

                  3. The Depositary  Shares will be validly  issued,  fully paid
         and  non-assessable by the Company and the Depositary  Receipts will be
         validly  issued  and will  entitle  the  holders  thereof to the rights
         specified therein and in the applicable Depositary Agreement,  when (i)
         the  conditions  set forth in  paragraph  2 above  with  respect to the
         related Preferred Shares are met, (ii) the Company's Board of Directors
         or  a  duly  authorized  committee  thereof  shall  have  duly  adopted
         resolutions (the "Final Depositary Shares  Resolutions")  approving one
         or more depositary  agreements,  including a form of Depositary Receipt
         set forth therein or related thereto (each, a "Depositary  Agreement"),
         relating to such Depositary Shares, between the Company and a financial
         institution  identified  therein as depositary  (each, a "Depositary"),
         (iii) the applicable Depositary Agreement shall have been duly executed
         and  delivered  by the  Company  and the  Depositary,  (iv) the related
         Preferred  Shares shall have been duly  deposited  with the  Depositary
         under  the  Depositary  Agreement  and  (v) the  applicable  Depositary
         Receipts shall have been duly executed by the Depositary as provided in
         the applicable  Depositary  Agreement and the Final  Depositary  Shares
         Resolutions  and  registered  and shall have been duly delivered to the
         purchasers   thereof  against  payment  of  the  agreed   consideration
         therefor,  as provided in the Registration  Statement,  the Prospectus,
         the  applicable  Prospectus   Supplement,   the  applicable  Depositary
         Agreement and the Final Depositary Shares Resolutions.

                  4. The Common  Shares will be validly  issued,  fully paid and
         non-assessable by the Company when (i) the Registration Statement shall
         have become  effective  under the  Securities  Act,  (ii) a  Prospectus
         Supplement  with  respect to such Common  Shares  shall have been filed
         with the  Commission  pursuant  to Rule 424 under the  Securities  Act,
         (iii) the Company's Board of Directors or a duly  authorized  committee
         thereof  shall have duly adopted final  resolutions  (the "Final Common
         Shares  Resolutions")  authorizing the issuance and sale of such Common
         Shares as contemplated by the  Registration  Statement,  the Prospectus
         and  the  applicable  Prospectus  Supplement,   and  (iv)  certificates
         evidencing   such  Common   Shares  shall  have  been  duly   executed,
         countersigned  and  registered  and duly  delivered  to the  purchasers
         thereof  against payment of the agreed  consideration  therefor (and in
         any  event an  amount  at least  equal to the par  value  thereof),  as
         provided 


Iron Mountain Incorporated
January 13, 1998
Page 6

         in  the  Registration   Statement,   the  Prospectus,   the  applicable
         Prospectus Supplement and the Final Common Shares Resolutions.  If such
         Common Shares are  Underlying  Registered  Securities,  the opinion set
         forth in this  paragraph is subject to the further  condition  that the
         Convertible  Registered  Securities  relating to such Common Shares, at
         the time of the  issuance  thereof and of the  conversion,  exchange or
         exercise thereof,  are validly issued, fully paid and non-assessable by
         the  Company or are  validly  issued  and  binding  obligations  of the
         Company, as applicable.

                  5. The Warrants will be duly authorized and validly issued and
         binding obligations of the Company when (i) the Registration  Statement
         shall have become effective under the Securities Act, (ii) a Prospectus
         Supplement with respect to such Warrants shall have been filed with the
         Commission  pursuant to Rule 424 under the  Securities  Act,  (iii) the
         Company's  Board of Directors or a duly  authorized  committee  thereof
         shall  have  duly  adopted  final   resolutions   (the  "Final  Warrant
         Resolutions")  authorizing  the issuance  and sale of such  Warrants as
         contemplated  by the  Registration  Statement,  the  Prospectus and the
         applicable  Prospectus  Supplement  and  approving  one or more warrant
         agreements,  including a form of warrant  set forth  therein or related
         thereto  (each,  a  "Warrant  Agreement"),  establishing  the terms and
         conditions  of such  Warrants,  between  the  Company  and a  financial
         institution  identified  therein as  warrant  agent  (each,  a "Warrant
         Agent"),  (iv) the applicable  Warrant  Agreement  shall have been duly
         executed and  delivered by the Company and the Warrant  Agent,  and (v)
         such  Warrants  shall  have  been  duly  executed  by the  Company  and
         authenticated  by the  Warrant  Agent  as  provided  in the  applicable
         Warrant Agreement and the Final Warrant  Resolutions and registered and
         shall  have been  duly  delivered  to the  purchasers  thereof  against
         payment  of the  agreed  consideration  therefor,  as  provided  in the
         Registration  Statement,  the  Prospectus,  the  applicable  Prospectus
         Supplement,  the  applicable  Warrant  Agreement  and the Final Warrant
         Resolutions. If such Warrants are Underlying Registered Securities, the
         opinion set forth in this paragraph is subject to the further condition
         that the Convertible  Registered  Securities relating to such Warrants,
         at the time of the issuance thereof and of the conversion,  exchange or
         exercise thereof,  are validly issued, fully paid and non-assessable by
         the  Company or are  validly  issued  and  binding  obligations  of the
         Company, as applicable.

         We hereby  consent to the  filing of this  opinion as an exhibit to the
Registration  Statement  and to the  reference  to our  firm  in the  Prospectus
forming a part of the Registration  Statement. In giving such consent, we do not
thereby  admit that we come  within the  category  of persons  whose  consent is
required  under Section 7 of the Act or under the rules and  regulations  of the
Commission promulgated thereunder.


Iron Mountain Incorporated
January 13, 1998
Page 5

                                        Very truly yours,

                                        /s/ Sullivan & Worcester LLP

                                        SULLIVAN & WORCESTER LLP