On July 30, 1945, the USS Indianapolis had just completed a top-secret drop off at Tinian Island in the Philippine Sea. Her crew of 1,195 believed their part in World War II had ended and now they could return home. But just after midnight, they were torpedoed by a Japanese submarine. The ship exploded and 300 men went down with it immediately. They were lucky.
The remaining 900 were left adrift under an oppressive sun for four days before they were discovered missing. The sailors struggled to avoid hordes of circling sharks, but approximately 150 of them were eviscerated. When help finally arrived on August 2, only 316 men were left.