It was midnight July 30, 1945, and just six days before the Enola Gay dropped the atomic bomb on Hiroshima. Returning from completing the most important mission of the war, the one that ultimately ended the war with Japan, the Indianapolis was torpedoed,and sank in less than 12 minutes. With the loss of 883 sailors, it was the worst naval disaster in American history. The USS Indianapolis was the last major American warship sunk during WWII.