The Indianapolis Shark Attack saw 880 sailors die in the sea, 1945.

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Survivors of the USS Indianapolis are taken to medical aid on the island of Guam. Photo from Wikipedia Commons.
The USS Indianapolis had delivered the crucial components of first operational atomic bomb to a naval base on the Pacific island of Tinian. On August 6, 1945, the weapon would level Hiroshima. But now, on July 28, the Indianapolis sailed from Guam, without an escort, to meet the battleship USS Idaho in the Leyte Gulf in the Philippines and prepare for an invasion of Japan.
The next day was quiet, with the Indianapolis making about 17 knots through swells of five or six feet in the seemingly endless Pacific. As the sun set over the ship, the sailors played cards and read books; some spoke with the ship’s priest, Father Thomas Conway.
But shortly after midnight, a Japanese torpedo hit the Indianapolis in the starboard bow, blowing almost 65 feet of the ship’s bow out of the water and igniting a tank containing 3,500 gallons of aviation fuel into a pillar of fire shooting several hundred feet into the sky.
Then another torpedo from the same submarine hit closer to midship, hitting fuel tanks and powder magazines and setting off a chain reaction of explosions that effectively ripped the Indianapolis in two.
Still traveling at 17 knots, the Indianapolis began taking on massive amounts of water; the ship sank in just 12 minutes. Of the 1,196 men aboard, 900 made it into the water alive.
Their ordeal—what is considered the worst shark attack in history—was just beginning.
As the sun rose on July 30, the survivors bobbed in the water. Life rafts were scarce. The living searched for the dead floating in the water and appropriated their lifejackets for survivors who had none. Hoping to keep some semblance of order, survivors began forming groups—some small, some over 300—in the open water.
Soon enough they would be staving off exposure, thirst—and sharks.
The animals were drawn by the sound of the explosions, the sinking of the ship and the thrashing and blood in the water. Though many species of shark live in the open water, none is considered as aggressive as the oceanic whitetip.
Reports from the Indianapolis survivors indicate that the sharks tended to attack live victims close to the surface, leading historians to believe that most of the shark-related casualities came from oceanic whitetips.
The first night, the sharks focused on the floating dead. But the survivors’ struggles in the water only attracted more and more sharks, which could feel their motions through a biological feature known as a lateral line: receptors along their bodies that pick up changes in pressure and movement from hundreds of yards away.
As the sharks turned their attentions toward the living, especially the injured and the bleeding, sailors tried to quarantine themselves away from anyone with an open wound, and when someone died, they would push the body away, hoping to sacrifice the corpse in return for a reprieve from a shark’s jaw.
Many survivors were paralyzed with fear, unable even to eat or drink from the meager rations they had salvaged from their ship. One group of survivors made the mistake of opening a can of Spam—but before they could taste it, the scent of the meat drew a swarm of sharks around them. They got rid of their meat rations rather than risk a second swarming.
The sharks fed for days, with no sign of rescue for the men.
Navy intelligence had intercepted a message from the Japanese submarine that had torpedoed the Indianapolis describing how it had sunk an American battleship along the Indianapolis’ route, but the message was disregarded as a trick to lure American rescue boats into an ambush.
In the meantime, the Indianapolis survivors learned that they had the best odds in a group, and ideally in the center of the group. The men on the margins or, worse, alone, were the most susceptible to the sharks.
Continue Reading via The Worst Shark Attack in History | History | Smithsonian.

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