Best known for his 1985 discovery of the Titanic, Robert Ballard has succeeded in tracking down numerous other significant shipwrecks, including the German battleship Bismarck, the lost fleet of Guadalcanal, the U.S. aircraft carrier Yorktown (sunk in the World War II Battle of Midway), and John F. Kennedy's boat, PT-109.

While those discoveries have captured the imagination of the public, Ballard believes his most important discoveries were of hydrothermal vents and "black smokers" in the Galapagos Rift and East Pacific Rise in 1977 and 1979 along with their exotic life forms living off the energy of the Earth through a process now called chemosynthesis.