A new era of undersea exploration began in 1943 when the young French naval officers, Philippe Tailliez, and the great civilian diver, plunged into the Mediterranean with the first aqualung, co-invented by .In this fascinating report, and tell what it is like to be "menfish" swimming in the deep twilight zone with sharks, mantas, morays, whales, and octopi. They tell of exploring sunken ships and of the treasures they brought up. They describe ventures into an inland water cave that all but claimed their lives, and their crazy human-guinea-pig experiment with underwater explosions. writes brilliantly of his audacious 50-fathom dive into the zone of rapture, where divers become like drunken gods; and of the 396-foot dive that took a brave companion's life.,, and their courageous teams of divers have used their new techniques of exploration to make important discoveries in almost every branch of science. In The Silent World they share with us the greatest undersea experience men have ever had.