Lost relics of the sea: Jacques Cousteau and the Calypso crew journey across two seas, the Mediterranean and the Caribbean, to recover the remains of great ships. Off northern Crete they find skulls, scattered bones and round pellets of grape-shot fired in a 300-year-old battle and at another site, 1st-century Roman jars. Their biggest wreck is uncovered at Martinique. In 1902, 30,000 people died when Mount Pele erupted and a harbor of ships disappeared into the depths. But at 150 feet, Cousteau's divers sight the Roraima, broken in two but intact. The warm-blooded sea, mammals of the deep: Marine mammals--dolphins, whales, seals--share a common, ancient heritage with man. Cousteau travels from the South Pacific to the Florida Keys, South Carolina, and Argentina to understand their evolution and unique behavior. In South Carolina's salt marshes, we observe dolphins herding fish into shallow water and onto dry land--the dolphins actually leave the water--before scooping up the fish and eating them.