In 1945, the Portland-class heavy cruiser USS Indianapolis, commanded by Captain Charles McVay (Nicolas Cage), delivers parts of the atomic bomb that would later be used to level Hiroshima during the ending of World War II. While patrolling in the Philippine Sea, on July 30 in 1945, the ship is torpedoed and sunk by the Imperial Japanese Navy (IJN) submarine I-58, taking 300 crewmen with it to the bottom of the Philippine Sea, while the rest climb out of the ship and are left stranded at sea for five days without food, water and left in shark infested waters.