Instinctive behavior occurs when an animal has a particular internal state while it is in the presence of a specific external stimulation called a releaser or a sign stimulus.
How many ships did the U-boats sink? During the war the U-boats sank about 2,779 ships for a total of 14.1 million tons GRT. This figure is roughly 70% of all allied shipping losses in all theatres of the war and to all hostile action. The most successful year was 1942 when over 6 million tons of shipping were sunk in the Atlantic.
The initial explosion set off a violent secondary blast. The ship sank in 18 minutes, with a lost of 1,195 of the 1,959 on board, including 123 Americans. Captain Turner was washed clear of the bridge as the ship sank, and survived after spending more than three hours in the water.