On the third day (IRRC) a shark ripped out the stomach of a sailor swimming in the water. He started screaming for someone to kill him. A sailor handed him a pistol, but it was fouled by the seawater and would not fire. So another sailor swam over and cut his throat with a knife.
The next day an American ship found them and as they got close started firing .50 cal machine guns in the water all around them. They thought they were being mistaken for Japanese sailors and were going to get massacred. But the American ships were just shooting the hundreds of sharks swarming around the floating sailors. Fun times.