Form of Letter of Transmittal

The Exchange Offer and Withdrawal Rights will expire at 5:00 p.m., New York City time, on March 30, 2006 (the “Expiration Date”), unless the Exchange Offer is extended by the Company.

IF YOU WISH TO EXCHANGE CURRENTLY OUTSTANDING 6.125% SERIES A SENIOR NOTES DUE 2014 (THE “OUTSTANDING NOTES”) FOR AN EQUAL AGGREGATE PRINCIPAL AMOUNT AT MATURITY OF NEW 6.125% SERIES B SENIOR NOTES DUE 2014 PURSUANT TO THE EXCHANGE OFFER, YOU MUST VALIDLY TENDER (AND NOT WITHDRAW) OUTSTANDING NOTES TO THE EXCHANGE AGENT PRIOR TO THE EXPIRATION DATE.

The undersigned hereby acknowledges receipt and review of the Prospectus, dated March 3, 2006 (the “Prospectus”), of Hornbeck Offshore Services, Inc., a Delaware corporation (the “Company”), and this Letter of Transmittal (the “Letter of Transmittal”), which together describe the Company’s offer (the “Exchange Offer”) to exchange its 6.125% Series B Senior Notes due 2014 (the “New Notes”) issued in a registered transaction under the Securities Act of 1933, as amended (the “Securities Act”), for a like principal amount of its issued and outstanding 6.125% Series A Senior Notes due 2014 (the “Outstanding Notes”). Capitalized terms used but not defined herein have the respective meaning given to them in the Prospectus.

The Company reserves the right, at any time or from time to time, to extend the Exchange Offer at its discretion, in which event the term “Expiration Date” shall mean the

latest date to which the Exchange Offer is extended. The Company shall notify the Exchange Agent and each registered holder of the Outstanding Notes of any extension by oral or written notice prior to 9:00 a.m., New York City time, on the next business day after the previously scheduled Expiration Date.

This Letter of Transmittal is to be used by holders of Outstanding Notes. Tender of Outstanding Notes is to be made according to the Automated Tender Offer Program (“ATOP”) of the Depository Trust Company (“DTC”) pursuant to the procedures set forth in the Prospectus under the caption “Exchange Offer-Procedures for Tendering”. DTC participants that are accepting the Exchange Offer must transmit their acceptance to DTC, which will verify the acceptance and execute a book-entry delivery to the Exchange Agent’s DTC account. DTC will then send a computer generated message known as an “agent’s message” to the Exchange Agent for its acceptance. For you to validly tender your Outstanding Notes in the Exchange Offer, the Exchange Agent must receive prior to the Expiration Date, an agent’s message under the ATOP procedures that confirms that:

BY USING THE ATOP PROCEDURES TO TENDER OUTSTANDING NOTES, YOU WILL NOT BE REQUIRED TO DELIVER THIS LETTER OF TRANSMITTAL TO THE EXCHANGE AGENT. HOWEVER, YOU WILL BE BOUND BY ITS TERMS, AND YOU WILL BE DEEMED TO HAVE MADE THE ACKNOWLEDGEMENTS AND THE REPRESENTATIONS AND WARRANTIES IT CONTAINS, JUST AS IF YOU HAD SIGNED IT.

1. By tendering Outstanding Notes in the Exchange Offer, you acknowledge receipt of the Prospectus and this Letter of Transmittal.

2. By tendering Outstanding Notes in the Exchange Offer, you represent and warrant that you have full authority to tender the Outstanding Notes described above and will, upon request, execute and deliver any additional documents deemed by the Company to be necessary or desirable to complete the tender of Outstanding Notes.

3. You understand that the tender of the Outstanding Notes pursuant to all of the procedures set forth in the Prospectus will constitute an agreement between you and the Company as to the terms and conditions set forth in the Prospectus.

4. By tendering Outstanding Notes in the Exchange Offer, you acknowledge that the Exchange Offer is being made in reliance upon interpretations contained in no-action letters issued to third parties by the staff of the Securities and Exchange Commission (the “SEC”), including Exxon Capital Holdings Corp., SEC No-Action Letter (available April 13, 1989), Morgan Stanley & Co., Inc., SEC No-Action Letter (available June 5, 1991) and Shearman & Sterling, SEC No-Action Letter (available July 2, 1993), that the New Notes issued in exchange for the Outstanding Notes pursuant to the Exchange Offer may be offered for resale, resold and otherwise transferred by holders thereof (other than a broker-dealer who purchased Outstanding Notes exchanged for such New Notes directly from the Company to resell pursuant to Rule 144A or any other available exemption under the Securities Act of 1933, as amended (the “Securities Act”) and any such holder that is an “affiliate” of the Company within the meaning of Rule 405 under the Securities Act), without compliance with the registration and prospectus delivery provisions of the Securities Act, provided that such New Notes are acquired in the ordinary course of such holders’ business and such holders are not participating in, and have no arrangement with any person to participate in, the distribution of such New Notes.

5. By tendering Outstanding Notes in the Exchange Offer, you hereby represent and warrant that:

a. the New Notes acquired pursuant to the Exchange Offer are being obtained in the ordinary course of business of the undersigned, whether or not you are the holder;

c. you have no arrangement or understanding with any person to participate in the distribution of New Notes;

d. you are not an “affiliate,” as such term is defined under Rule 405 promulgated under the Securities Act, of the Company, or if you are an affiliate, you will comply with the registration and prospectus delivery requirements of the Securities Act to the extent applicable; and

e. if you are a broker-dealer, that will receive New Notes for your own account in exchange for Outstanding Notes that were acquired as a result of market-making activities or other trading activities, and that you acknowledge that you will deliver a

prospectus in connection with any resale of such New Notes; however, by so acknowledging and by delivering a prospectus, you will not be deemed to admit that you are an “underwriter” within the meaning of the Securities Act. If you are a broker-dealer and Outstanding Notes held for your own account were not acquired as a result of market-making or other trading activities, such Outstanding Notes cannot be exchanged pursuant to the Exchange Offer.

6. Any obligation of the undersigned hereunder shall be binding upon the successors, assigns, executors, administrators, trustees in bankruptcy and legal and personal representatives of the undersigned.

Any confirmation of a book-entry transfer to the Exchange Agent’s account at DTC of Outstanding Notes tendered by book-entry transfer (a “Book-Entry Confirmation”), as well as an agent’s message, and any other documents required by this Letter of Transmittal, must be received by the Exchange Agent at its address set forth herein prior to 5:00 p.m., New York City time, on the Expiration Date.

Only a registered holder of Outstanding Notes may tender such Outstanding Notes in the Exchange Offer. Any beneficial holder of Outstanding Notes who is not the registered holder and who wishes to tender should arrange with the registered holder to execute and deliver this Letter of Transmittal on his behalf or must, prior to completing and executing this Letter of Transmittal and delivering his Outstanding Notes, either make appropriate arrangements to register ownership of the Outstanding Notes in such holder’s name or obtain a properly completed bond power from the registered holder.

Tenders of Outstanding Notes will be accepted only in integral multiples of $1,000. The entire principal amount of Outstanding Notes delivered to the Exchange Agent will be deemed to have been tendered unless otherwise communicated to the Exchange Offer. If the entire principal amount of all Outstanding Notes is not tendered, then Outstanding Notes for the principal amount of Outstanding Notes not tendered and New Notes issued in exchange for any Outstanding Notes accepted will be credited to the account of the tendering holder via the facilities of DTC, promptly after the Outstanding Notes are accepted for exchange.

All questions as to the validity, form, eligibility (including time of receipt), acceptance, and withdrawal of tendered Outstanding Notes will be determined by the Company, in its sole discretion, which determination will be final and binding. The Company reserves the absolute right to reject any or all tenders not in proper form or the acceptance for exchange of which may, in the opinion of counsel for the Company, be unlawful. The Company also reserves the absolute right to waive any of the conditions of the Exchange Offer or any defect or irregularity in the tender of any Outstanding Notes. The Company’s interpretation of the terms and conditions of the Exchange Offer (including the instructions on the Letter of Transmittal) will be final and binding on all parties. Unless waived, any defects or irregularities in connection with tenders of Outstanding Notes must be cured within such time as the Company shall determine. Although the Company intends to notify holders of defects or irregularities with respect to tenders of Outstanding Notes, neither the Company, the

Exchange Agent, nor any other person shall be under any duty to give notification of any defects or irregularities in tenders or incur any liability for failure to give such notification. Tenders of Outstanding Notes will not be deemed to have been made until such defects or irregularities have been cured or waived. Any Outstanding Notes received by the Exchange Agent that are not properly tendered and as to which the defects or irregularities have not been cured or waived will be returned by the Exchange Agent to the tendering holders, unless otherwise provided in the Letter of Transmittal, as soon as practicable following the Expiration Date.

The Company reserves the absolute right to waive, in whole or part, in its sole discretion, any of the conditions to the Exchange Offer set forth in the Prospectus or in this Letter of Transmittal.

No alternative, conditional, irregular or contingent tender of Outstanding Notes will be accepted.

Requests for assistance or for additional copies of the Prospectus or this Letter of Transmittal may be directed to the Exchange Agent at the address or telephone number set forth on the cover page of this Letter of Transmittal. Holders may also contact their broker, dealer, commercial bank, trust company or other nominee for assistance concerning the Exchange Offer.

Tenders may be withdrawn only pursuant to the limited withdrawal rights set forth in the Prospectus under the caption “Exchange Offer-Withdrawal of Tenders.”

IMPORTANT: BY USING THE ATOP PROCEDURES TO TENDER OUTSTANDING NOTES, YOU WILL NOT BE REQUIRED TO DELIVER THIS LETTER OF TRANSMITTAL TO THE EXCHANGE AGENT. HOWEVER, YOU WILL BE BOUND BY ITS TERMS, AND YOU WILL BE DEEMED TO HAVE MADE THE ACKNOWLEDGEMENTS AND THE REPRESENTATIONS AND WARRANTIES IT CONTAINS, JUST AS IF YOU HAD SIGNED IT.