Exhibit 3.3

EXHIBIT B

SECOND AMENDED AND RESTATED BYLAWS

OF

ODYSSEY MARINE EXPLORATION, INC.

(A Nevada corporation)

ARTICLE I - STOCKHOLDERS

1. Certificates Representing Stock. Every holder of stock in Odyssey Marine Exploration, Inc. (the “Corporation”) shall be entitled to have a certificate signed by, or in the name of, the Corporation by the Chairman or one of the Co-Chairmen of the Board of Directors, if any, or by the President or a Vice-President and by the Treasurer or an Assistant Treasurer or the Secretary or an Assistant Secretary of the Corporation or by agents designated by the Board of Directors, certifying the number of shares owned by him in the Corporation and setting forth any additional statements that may be required by the Nevada Business Corporation Act. If any such certificate is countersigned or otherwise authenticated by a transfer agent or transfer clerk or by a registrar other than the Corporation, a facsimile of the signature of any such officers or agents designated by the Board may be printed or lithographed upon such certificate in lieu of the actual signatures. In case any officer or officers who shall have signed, or whose facsimile signature or signatures shall have been used on, any such certificate or certificates shall cease to be such officer or officers of the Corporation before such certificate or certificates shall have been delivered by the Corporation, such certificate or certificates may nevertheless be adopted by the Corporation and be issued and delivered as though the person or persons who signed such certificate or certificates, or whose facsimile signature or signatures shall have been used thereon, had not ceased to be such officer or officers of the Corporation.

Whenever the Corporation shall be authorized to issue more than one class of stock or more than one series of any class of stock, and whenever the Corporation shall issue any shares of special stock, the certificates representing shares of any such class or series or of any such special stock shall set forth thereon the statements prescribed by the Nevada Business Corporation Act. Any restrictions on the transfer or registration of transfer of any shares of stock of any class or series shall be noted conspicuously on the certificate representing such shares.

The Corporation may issue a new certificate of stock in place of any certificate theretofore issued by it, alleged to have been lost, stolen or destroyed and the Board of Directors may require the owner of any lost, stolen or destroyed certificate, or his legal representative, to give the Corporation a bond sufficient to indemnify the Corporation against any claim that may be made against it on account of the alleged loss, theft, or destruction of any such certificate or the issuance of any new certificate.

2. Fractional Share Interests. The Corporation shall not be obliged to but may execute and deliver a certificate for or including a fraction of a share. In lieu of executing and delivering a certificate for a fraction of a share, the Corporation may pay to any person otherwise entitled to become a holder of a fraction of a share an amount in cash specified for such purpose as the value thereof in the resolution of the Board of Directors, or other instrument pursuant to which such fractional share would otherwise be issued, or, if not specified therein, then as may be determined for such purpose by the Board of Directors of the issuing corporation; or may execute and deliver registered or bear scrip over the manual or facsimile signature of an officer

of the Corporation or of its agent for that purpose, exchangeable as therein provided for full share certificates, but such scrip shall not entitle the holder to any rights as a stockholder except as therein provided. Such scrip may provide that it shall become void unless the rights of the holders are exercised within a specified period and may contain any other provisions or conditions that the Corporation shall deem advisable. Whenever any such scrip shall cease to be exchangeable for full share certificates, the shares that would otherwise have been issuable as therein provided shall be deemed to be treasury shares unless the scrip shall contain other provisions for their disposition.

3. Stock Transfers. Upon compliance with provisions restricting the transfer or registration of transfer of shares of stock, if any, transfers or registration of transfers of shares of stock of the Corporation shall be made only on the stock ledger of the Corporation by the registered holder thereof, or by his attorney thereunto authorized by power of attorney duly executed and filed with the Secretary of the Corporation or with a transfer agent or a registrar, if any, and on surrender of the certificate or certificates for such shares of stock properly endorsed and the payment of all taxes, if any, due thereon.

4. Record Date for Stockholders. For the purpose of determining the stockholders entitled to notice of or to vote at any meeting of stockholders or any adjournment thereof, or to express consent to corporate action in writing without a meeting, or entitled to receive payment of any dividend or other distribution or the allotment of any rights, or entitled to exercise any rights in respect of any change, conversion or exchange of stock or for the purpose of any other lawful action, the directors may fix, in advance, a record date, which shall not be more than sixty days nor less than ten days before the date of such meeting, nor more than sixty days prior to any other action. If no record date is fixed, the record date for determining stockholders entitled to notice of or to vote at a meeting of stockholders shall be at the close of business on the day next preceding the date on which notice is given, or, if notice is waived, at the close of business on the day next preceding the date on which the meeting is held; the record date for determining stockholders entitled to express consent to corporate action in writing without a meeting, when no prior action by the Board of directors is necessary, shall be the day on which the first written consent is expressed; and the record date for determining stockholders for any other purpose shall be at the close of business on the day on which the Board of Directors adopts the resolution relating thereto. A determination of stockholders of record entitled to notice of or to vote at any meeting of stockholders shall apply to any adjournment of the meeting; provided, however, that the Board of Directors may fix a new record date for the adjourned meeting.

5. Meaning of Certain Terms. As used in these Bylaws in respect of the right to notice of a meeting of stockholders or a waiver thereof or to participate or vote thereat or to consent to dissent in writing in lieu of a meeting, as the case may be, the term “share” or “shares” or “share of stock” or “shares of stock” or “stockholder” or “stockholders” refers to an outstanding share or shares of stock and to a holder or holders of record of outstanding shares of stock when the Corporation is authorized to issue only one class of shares of stock, and said reference is also intended to include any outstanding share or shares of stock and any holder or holders of record of outstanding shares of stock of any class upon which or upon whom the Articles of Incorporation confers such rights where there are two or more classes or series of shares of stock or upon which or upon whom the Nevada Business Corporation Act confers such rights notwithstanding that the Articles of Incorporation may provide for more than one class or

- 2 -

series of shares of stock, one or more of which are limited or denied such rights thereunder; provided, however, that no such right shall vest in the event of an increase or a decrease in the authorized number of shares of stock of any class or series which is otherwise denied voting rights under the provisions of the Articles of Incorporation.

6. Stockholder Meetings.

Time. The annual meeting shall be held on the date and at the time fixed, from time to time, by the directors, provided, that the first annual meeting shall be held on a date within thirteen months after the organization of the Corporation, and each successive annual meeting shall be held on a date within thirteen months after the date of the preceding annual meeting. A special meeting shall be held on the date and at the time fixed by the directors.

Place. Annual meetings and special meetings shall be held at such place, within or without the State of Nevada, as the directors may, from time to time, fix. Whenever the directors shall fail to fix such place, the meeting shall be held at the principal office of the Corporation in the State of Nevada.

Call. Special meetings may be called by the President, the Board of Directors or holders of not less than 1/10th of all shares entitled to vote at a meeting.

Notice or Waiver of Notice. Notice of all meetings shall be in writing and signed by the President or a Vice-President, or the Secretary, or an Assistant Secretary, or by such other person or persons as the directors shall designate. Such notice shall state the purpose or purposes for which the meeting is called and the time when, and the place, where it is to be held. A copy of such notice shall be either delivered personally to, or shall be mailed postage prepaid, to each stockholder not less than ten nor more than sixty days before such meeting. If mailed, it shall be directed to a stockholder at his address as it appears upon the records of the Corporation. Any stockholder may waive notice of any meeting by a writing signed by him, or his duly authorized attorney, either before or after the meeting; and whenever notice of any kind is required to be given under the provisions of the Nevada Business Corporation Act, a waiver thereof in writing and duly signed whether before or after the time stated therein, shall be deemed equivalent thereto.

Conduct of Meeting. Meetings of the stockholders shall be presided over by one of the following officers in the order of seniority and if present and acting - the Chairman of the Board, if any, the Co-Chairmen of the Board, if any, the President, a Vice-President, or, if none of the foregoing is in office and present and acting, by a chairman to be chosen by the stockholders. The Secretary of the Corporation, or in his absence, an Assistant Secretary, shall act as secretary of every meeting, but if neither the Secretary nor an Assistant Secretary is present the chairman of the meeting shall appoint a secretary of the meeting.

Proxy Representation. Every stockholder may authorize another person or persons to act for him by proxy appointed by an instrument in writing in all matters in which a stockholder is entitled to participate, whether by voting or participating at a meeting, or expressing consent or dissent without a meeting. Every proxy must be executed by the stockholder or by his attorney-in-fact. No proxy shall be valid after the expiration of eleven months from the date of its

- 3 -

creation, unless coupled with an interest or unless the stockholder specifies in it therein the length of time for which it is to continue in force, which in no case shall exceed seven years from the date of its creation.

Inspectors. The directors, in advance of any meeting, may, but need not, appoint one or more inspectors of election to act at the meeting or any adjournment thereof. If an inspector or inspectors are not appointed, the person presiding at the meeting may, but need not, appoint one or more inspectors. In case any person who may be appointed as an inspector fails to appear or act, the vacancy may be filled by appointment made by the directors in advance of the meeting or at the meeting by the person presiding thereat. Each inspector, if any, before entering upon the discharge of his duties, shall take and sign an oath faithfully to execute the duties of inspector at such meeting with strict impartiality and according to the best of his ability. The inspectors, if any, shall determine the number of shares of stock outstanding and the voting power of each, the shares of stock represented at the meeting, the existence of a quorum, the validity and effect of proxies, and shall receive votes, ballots or consents, hear and determine all challenges and questions arising in connection with the right to vote, count and tabulate all votes, ballots or consents, determine the result, and do such acts as are proper to conduct the election or vote with fairness to all stockholders. On request of the person presiding at the meeting, the inspector or inspectors, if any, shall make a report in writing of any challenge, question or matter determined by him or them and execute a certificate of any fact found by him or them.

Quorum. The holders of a majority of the outstanding shares of stock or of the voting power, as the case may be, shall constitute a quorum at a meeting of stockholders for the transaction of any business unless the action to be taken at the meeting shall require a different proportion. The stockholders present may adjourn the meeting despite the absence of a quorum.

Voting. Each share of stock shall entitle the holder thereof to one vote. In the election of directors, a plurality of the votes cast shall elect. Any other action shall be authorized by a majority of the votes cast except where the Nevada Business Corporation Act, the Articles of Incorporation, or these Bylaws prescribe a different percentage of votes and/or a different exercise of voting power. In the election of directors, voting need not be by ballot; and, except as otherwise may be provided by the Nevada Business Corporation Act, voting by ballot shall not be required for any other action.

7. Stockholder Action Without Meetings. Except as may otherwise be provided by the Nevada Business Corporation Act, any action required or permitted to be taken by the vote of stockholders at a meeting, may be taken without a meeting if authorized by the written consent of stockholders holding at least a majority of the voting power; provided that if a different proportion of voting power is required for such action at a meeting, then that proportion of written consents shall be required. In no instance where action is authorized by written consent need a meeting of stockholders be called or notice given. The written consent must be filed with the minutes of the proceedings of the stockholders. Any written consent shall be subject to the requirements of Section 78.320 of the Nevada Business Corporation Act and of any other applicable provision of law.

- 4 -

ARTICLE II - DIRECTORS

1. Functions and Definition. Except as provided in the Articles of Incorporation, the business and affairs of the Corporation shall be managed by the Board of Directors of the Corporation. The Board of Directors shall have authority to fix the compensation of the members thereof for services in any capacity. The use of the phrase “whole Board” herein refers to the total number of directors which the Corporation would have if there were no vacancies.

2. Qualifications and Number. Each director must be at least 18 years of age. A director need not be a stockholder or a resident of the State of Nevada. Subject to the Articles of Incorporation, the number of directors constituting the Board of Directors shall be determined and may be increased or decreased, to not less than one director, by resolution of the Board of Directors.

3. Election and Term. Directors may be elected in the manner prescribed by the provisions of Sections 78.320 through 78.335 of the Nevada Business Corporation Act. The first Board of Directors shall hold office until the first election of directors by stockholders and until their successors are elected and qualified or until their earlier resignation or removal. Any director may resign at any time upon written notice to the Corporation. Thereafter, except as provided in the Articles of Incorporation, directors who are elected at an election of directors by stockholders, and directors who are elected in the interim to fill vacancies and newly created directorships, shall hold office until the next election of directors by stockholders and until their successors are elected and qualified or until their earlier resignation or removal.

4. Meetings.

Time. Meetings shall be held at such time as the Board shall fix, except that the first meeting of a newly elected Board shall be held as soon after its election as the director may conveniently assemble.

Place. Meetings shall be held at such place within or without the State of Nevada as shall be fixed by the Board.

Call. No call shall be required for regular meetings for which the time and place have been fixed. Special meetings may be called by or at the direction of the Chairman of the Board, if any, the Co-Chairmen of the Board of Directors, if any, or the President, or of a majority of the directors in office.

Notice or Actual or Constructive Waiver. No notice shall be required for regular meetings for which the time and place have been fixed. Written, oral or any other mode of notice of the time and place shall be given for special meetings in sufficient time for the convenient assembly of the directors thereat. Notice if any need not be given to a director or to any member of a committee of directors who submits a written waiver of notice signed by him before or after the time stated therein.

Quorum and Action. A majority of the whole Board shall constitute a quorum except when a vacancy or vacancies prevents such majority, whereupon a majority of the directors in office shall constitute a quorum, provided, that such majority shall constitute at least one-third of

- 5 -

the whole Board. A majority of the directors present, whether or not a quorum is present, may adjourn a meeting to another time and place. Except as the Articles of Incorporation or these Bylaws may otherwise provide, and except as otherwise provided by the Nevada Business Corporation Act, the act of a majority of the directors present at a meeting at which a quorum is present shall be the act of the Board. The quorum and voting provisions herein stated shall not be construed as conflicting with any provisions of the Nevada Business Corporation Act and these Bylaws which govern a meeting of directors held to fill vacancies and newly created directorships in the Board or action of disinterested directors.

Members of the Board or of any committee which may be designated by the Board may participate in a meeting of the Board or of any such committee, as the case may be, by means of a conference telephone network or a similar communications method by which all persons participating in the meeting hear each other. Participation in a meeting by said means shall constitute presence in person at any such meeting. Each person participating in a meeting by such means shall sign the minutes thereof.

Chairman of the Meeting. The Chairman of the Board, if any, and if present and acting, shall preside at all meetings. Otherwise, the Co- Chairmen of the Board, if any, and if present and acting, or one of the Co- Chairmen, if only one is present and acting, or the President, if present and acting, or any other director chosen by the Board, shall preside.

5. Removal of Directors. Any or all of the directors may be removed for cause or without cause by the holders of at least two thirds of the voting power of the outstanding stock of the Corporation. One or more of the directors may be removed for cause by the Board of Directors.

6. Committees. Whenever its number consists of two or more, the Board of Directors may, by resolution passed by a majority of the whole Board, designate one or more committees, each committee to consist of one or more of the directors of the Corporation and each committee to have such powers and duties as the Board shall determine. Any such committee, to the extent provided in the resolution or resolutions of the Board, shall have and may exercise the powers and authority of the Board of Directors in the management of the business and affairs of the Corporation and may authorize the seal or stamp of the Corporation to be affixed to all papers on which the Corporation desires to place a seal or stamp.

7. Written Action. Any action required or permitted to be taken at any meeting of the Board of Directors or of any committee thereof may be taken without a meeting if, before or after the action, a written consent thereto is signed by all the members of the Board or committee, as the case may be. The written consent must be filed with the minutes of proceedings of the Board or committee.

ARTICLE III - OFFICERS

1. Officers. The Corporation shall have a President, a Secretary, a Treasurer, a Resident Agent, and, if deemed necessary, expedient or desirable by the Board of Directors, a Chairman of the Board or Co-Chairmen of the Board, a Chief Executive Officer, an Executive Vice-President, one or more other Vice-Presidents, one or more Assistant Secretaries, one or

- 6 -

more Assistant Treasurers, and such other officers, agents and factors with such titles as the resolution choosing them shall designate. Each of any such officers, agents and factors shall be chosen by the Board of Directors or chosen in the manner determined by the Board of Directors.

2. Qualifications. Except as may otherwise be provided in the resolution choosing him, no officer other than the Chairman of the Board, if any, or Co-Chairmen of the Board, if any, need be a director.

Any two or more offices may be held by the same person, as the directors may determine.

3. Term of Office. Unless otherwise provided in the resolution choosing him, each officer, except the Resident Agent, shall be chosen for a term which shall continue until the meeting of the Board of Directors following the next annual meeting of stockholders and until his successor shall have been chosen and qualified. The Resident Agent shall serve until his or its successor shall have been chosen and qualified.

Any officer may be removed, with or without cause, by the Board of Directors or in the manner determined by the Board.

Any vacancy in any office may be filled by the Board of Directors or in the manner determined by the Board.

4. Duties and Authority. All officers of the Corporation shall have such authority and perform such duties in the management and operation of the Corporation as shall be prescribed in the resolution designating and choosing such officers and prescribing their authority and duties, and shall have such additional authority and duties as are incident to their office except to the extent that such resolutions or instruments may be inconsistent therewith. In the event that Co-Chairmen are elected, instead of a unitary Chairman, and if there are two or more Co-Chairmen, they shall constitute an “Office of the Chairman of the Board.” The decision of any individual Co-Chairman on matters within their authority may be overruled by a majority vote of the Co-Chairmen then in Office if there are three or more Co-Chairmen. If there are two Co-Chairmen and they are unable to agree on a decision, or if a deadlock in the vote of the Co-Chairmen as to a decision otherwise exists, the decision shall be referred to the full Board of Directors for resolution.

ARTICLE IV - PRINCIPAL AND REGISTERED OFFICES

Initially, the principal office and place of business of the Corporation will be located in the State of Florida at 3507 Frontage Road, Suite 100, Tampa, Florida 33607. The Company’s registered office in the State of Nevada is located at The Corporation Trust Company of Nevada, 1 East First Street, Reno, Nevada 89501. Other offices and places of business may be established from time to time by resolution of the Board of Directors or as the business of the Corporation may require.

The Corporation shall maintain at said registered office a copy of its Articles of Incorporation, and all amendments thereto, and a copy of these Bylaws, and all amendments thereto, as certified by the Secretary of the Corporation. The Corporation shall also keep at said registered office a stock ledger or a duplicate stock ledger, revised annually, containing the

- 7 -

names, alphabetically arranged, of all persons who are stockholders of the Corporation, showing their places of residence, if known, and the number of shares held by them respectively or a statement setting out the name of the custodian of the stock ledger or duplicate stock ledger, and the present and complete post office address, including street and number, if any, where such stock ledger or duplicate stock ledger is maintained.

ARTICLE V - CORPORATE SEAL OR STAMP

The Corporate seal or stamp shall be in such form as the Board of Directors may prescribe.

ARTICLE VI - FISCAL YEAR

The fiscal year of the Corporation shall be January 1 through December 31 of each year.

ARTICLE VII - CLAIMS AGAINST THE COMPANY

1. Forum Selection. Unless the Corporation consents in writing to the selection of an alternative forum, the courts of the State of Nevada located in Clark County, Nevada shall be the sole and exclusive forum for (i) any derivative action or proceeding brought on behalf of the Corporation, (ii) any action asserting a claim for breach of a fiduciary duty owed by any director, officer, employee or agent of the Corporation to the Corporation or the Corporation’s stockholders, (iii) any action asserting a claim arising pursuant to any provision of the Nevada Business Corporation Act, the Articles of Incorporation or these Bylaws or (iv) any action asserting a claim governed by the internal affairs doctrine, in each case subject to said court having personal jurisdiction over the indispensable parties named as defendants therein.

2. Fees. In the event that (i) any current or prior stockholder or anyone on their behalf (a “Claiming Party”) initiates or asserts any claim or counterclaim (each a “Claim”) or joins, offers substantial assistance to or has a direct financial interest in any Claim against the Corporation or any other stockholder (including any Claim purportedly filed on behalf of the Corporation or any stockholder), other than a Claim based on an express written contract to which the Claiming Party and the Corporation are signatories, and (ii) the Claiming Party (or the third party that received substantial assistance from the Claiming Party or in whose Claim the Claiming Party had a direct financial interest) does not obtain a judgment on the merits that substantially achieves, in substance and amount, the full remedy sought, then each Claiming Party shall, be obligated jointly and severally to reimburse the Corporation and any such stockholder for all fees, costs and expenses of every kind and description (including, but not limited to, all reasonable attorneys’ fees and other litigation expenses) that the Corporation may incur in connection with such Claim.

ARTICLE VIII - CONTROL OVER BYLAWS

The power to amend, alter and repeal these Bylaws and to make new Bylaws shall be vested in the Board of Directors subject to the Bylaws, if any, adopted by the stockholders.

[Remainder of page left intentionally blank.]

- 8 -

I HEREBY CERTIFY that the foregoing is a full, true and correct copy of the Amended and Restated Bylaws of Odyssey Marine Exploration, Inc., a Nevada corporation, as in effect on the date hereof.

WITNESS my hand and the seal or stamp of the Corporation.

Dated this 11th day of March, 2015.

[Signature Page to Second Amended and Restated Bylaws]