Odyssey Marine Exploration Officially Listed On Russell 3000(R) Index.

Odyssey Added to Russell 3000, Russell 2000, and Russell Microcap Indexes

TAMPA, Fla. -- Odyssey Marine Exploration (AMEX:OMR), the world's leader in the field of deep-ocean shipwreck exploration, has been officially included in the Russell 3000, the Russell 2000, and the Russell Microcap Indexes.

The final index list was announced by Russell Investment Group at the end of business day on Friday, June 22, 2007. The Russell Group has posted the final membership lists, which include Odyssey Marine Exploration, on www.russell.com.

"Odyssey Marine Exploration is excited to be formally accepted for inclusion in the Russell equity indexes. This puts us on the radar of a wider audience in the investment community and validates our consistent efforts to build shareholder value by sharing our story with as many constituencies as possible," said John Morris, CEO of Odyssey Marine Exploration.

Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for both passive and active investment strategies. The combined market capitalization of stocks in the Russell 3000, which reflects about 98% of the investable U.S. equity universe, has increased more than $3 trillion from $15.3 trillion at this point last year to $18.5 trillion today. Annual reconstitution of Russell indexes captures the 3,000 largest U.S. stocks as of the end of May, ranking them by total market capitalization to create the Russell 3000.

About Russell:

Russell Investment Group aims to improve financial security for people by providing strategic advice, world-class implementation, state-of-the-art performance benchmarks and a range of institutional-quality investment products. With more than $200 billion in assets under management, Russell serves individual, institutional and advisor clients in more than 40 countries. Russell provides access to some of the world's best money managers. It helps investors put this access to work in corporate defined benefit and defined contribution plans, and in the life savings of individual investors.

Founded in 1936, Russell is a subsidiary of Northwestern Mutual Life Insurance Company and headquartered in Tacoma, Wash. Russell has principal offices in Amsterdam, Auckland, Hong Kong, Johannesburg, London, Melbourne, New York, Paris, San Francisco, Singapore, Sydney, Tokyo and Toronto.

About Odyssey Marine Exploration:

Odyssey Marine Exploration is a Publicly Traded US Company with several shipwreck projects in various stages of development throughout the world. Additional information about Odyssey, the SS Republic shipwreck, the "Black Swan" project, and the Company's other activities is available at www.shipwreck.net.

Odyssey Marine Exploration believes the information set forth in this Press Release may include "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933 and Section 21E of the Securities Act of 1934. Certain factors that could cause results to differ materially from those projected in the forward-looking statements are set forth in "Risk Factors" in the Part I, Item 1A of the Company's Annual Report on Form 10-K for the year ended December 31, 2006, which has been filed with the Securities and Exchange Commission.