USS Indianapolis (CL/CA-35) was a Portland-class heavy cruiser of the United States Navy, named for the city of Indianapolis, Indiana. Launched in 1931, the vessel served as the flagship for the commander of Scouting Force 1 for eight years, then as flagship for Admiral Raymond Spruance in 1943 and 1944 while he commanded the Fifth Fleet in battles across the Central Pacific during World War II.

In July 1945, Indianapolis completed a top-secret high-speed trip to deliver parts of Little Boy, the first nuclear weapon ever used in combat, to the United States Army Air Force Base on the island of Tinian, and subsequently departed for the Philippines on training duty. At 0015 on 30 July, the ship was torpedoed by the Imperial Japanese Navy submarine I-58, and sank in 12 minutes. Of 1,195 crewmen aboard, approximately 300 went down with the ship.[4] The remaining 890 faced exposuredehydrationsaltwater poisoning, and shark attacks while stranded in the open ocean with few lifeboats and almost no food or water. The Navy only learned of the sinking four days later, when survivors were spotted by the crew of a PV-1 Ventura on routine patrol. Only 316 survived.[4] The sinking of Indianapolis resulted in the greatest single loss of life at sea, from a single ship, in the history of the US Navy.[a]

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