Today is the 70th anniversary of the sinking of the USS Indianapolis, of one of the most terrible catastrophes in the history of the United States Navy. After completing a mission to deliver parts for the atomic bomb that would fall on Hiroshima, the battleship was struck by a torpedo from Japanese submarine I-58 en route to the Philippines. The Indianapolis sank, taking with it a over 300 crewman. The sinking launched a five-day ordeal in which just under 600 more sailors would be killed.

After the Indianapolis sank, crewmen endured days of exposure to the elements, dehydration—and most horrifyingly of all—shark attacks. The sheer amount of blood in the water surrounding the the ship’s debris set off a shark feeding frenzy…

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