The Viking warship of King Cnut the Great. Henry VIII's the Mary Rose. Captain John Franklin's doomed HMS Terror. The SS Gairsoppa, destroyed by a Nazi U-boat in the Atlantic during World War II. Since we first set sail on the open sea, ships and their wrecks have been an inevitable part of human history. Archaeologists have made spectacular discoveries excavating these sunken ships, their protective underwater cocoon keeping evidence of past civilizations...