The underseaa world is an unseen battleground. Join Dr. Robert Ballard, former naval intelligence officer and discoverer of the RMS Titanic, as he reveals how the race for global domination as eon from the deapest reaches of the ocean. Using rare archival footage and fully animated recreations, this fascinating documentary examines the technology behind Cold War nuclear subs along with other recently declassified defense systems, such as SOSUS, the U.S. Navy's top-secret sound survelliance network. Sea Spies also looks at the key historical developments that influenced twentieth century warfare and features interviews with marine experts as well as high-ranking military officials.