Elenco (na ordem dos créditos)
Robert Ballard
Self - Explorer At Large, National Geographic Society + President and Founder, Ocean Exploration Trust
Barbara Earle Ballard
Self - Director, Special Projects, National Geographic 1988 to 1990
Ben Ballard
Self - Bob's Son
Chet Ballard
Self - Bob's Dad, Unaired Interview, July 1989
Doug Ballard
Emily Ballard
Self - Bob's Daughter
Harriett Ballard
Self - Bob's Mom, Unaired Interview, July 1989
Todd Ballard
Self - Bob's Son, Unaired Interview, July 1989
Cassie Bongiovanni
Self - Director of Mapping Operations, Caladan Oceanic
Peter Jennings
Self - World News Tonight(archiveFootage)
N. Ronald Thunman
Self - Vice Admiral, United States Navy, Retired(voice)
Kirk Douglas
Self - Ned Land, 20000 Leagues Under the Sea 1954(uncredited)(archiveFootage)
John Lehman
Self - Secretary of the Navy(uncredited)(archiveFootage)
Peter Lorre
Self - Conseil, 20000 Leagues Under The Sea 1954(uncredited)(archiveFootage)
Paul Lukas
Self - Professor Arronax, 20000 Leagues Under The Sea 1954(uncredited)(archiveFootage)
James Mason
Self - Captain Nemo, 20000 Leagues Under the Sea 1954(uncredited)(archiveFootage)