According to ”Ocean of Fear,” a 2007 episode of the Discovery Channel documentary series Shark Week, this resulted in the most shark attacks on humans in a single event on record. The sharks began to gather, at first curious about the sound of the explosions; and then excited by so much thrashing and blood in the water.

Though many kinds of sharks live in the open water, none are as aggressive as the oceanic whitetip. Survivors of the Indianapolis sinking reported that the sharks were attacking live victims near the surface of the water, leading historians to believe that most of the attacking sharks were oceanic whitetips.

On the first night, the marine marauders dragged away the floating dead. But as the survivors struggled in the water, their thrashing attracted more and more sharks, which could feel the sailor’s movements through a shark sense organ called the lateral line: receptors along their bodies that sense changes in pressure and movement from hundreds of yards away.

As the sharks began to attack and devour the living, focusing their assault on the injured and the bleeding, the sailors tried to keep their distance from anybody with an open wound, and when a comrade died, they would push the corpse away, hoping to sacrifice the body of their fallen comrade to escape their own grizzly death in a shark’s jaw.

Many of the survivors were paralyzed with fear, and unable to even eat or drink from the few rations they managed to salvage from their sunken ship. One group made the mistake of opening a can of Spam and the scent of the meat attracted a swarm of sharks around them. They got rid of their meat rations rather than risk another swarm of sharks.

In a colossal dereliction of duty, several members of the U.S. Navy failed to learn of the Indianapolis’ sinking or respond to the crew’s distress signals. Lieutenant Stuart B. Gibson, the Operations Officer under the Port Director, Tacloban, was the officer responsible for keeping track of the movements of the Indianapolis.

When the vessel did not arrive on schedule, it was known immediately by Lieutenant Gibson, yet he failed to investigate the issue further and made no mention that the vessel was overdue to his superiors.

In the Navy’s first official statement regarding the sinking, it said that distress calls “were keyed by radio operators and possibly were actually transmitted,” but that “no evidence has been developed that any distress message from the ship was received by any ship, aircraft or shore station.”

Later declassified records would reveal that in fact three Navy stations had received the signals, and that all three had failed to act upon the call! The reasons why: One commander was drunk, another had ordered his crew not to disturb him, and the other thought the call for help was a Japanese trap.

In a story that only gets stranger, after this massive, systemic failure by multiple U.S. Navy officers to respond to the Indianapolis’ distress calls, leaving its crew to fend off shark attacks for three days before a chance air patrol initiated their rescue, the Navy blamed the captain of the ship for the sinking and court martialed him for “”hazarding his ship by failing to zigzag.”

Lieutenant Gibson only received a letter of reprimand for failing to notify anyone that the vessel was overdue and unaccounted for. The acting commander and operations officer of the Philippine Sea Frontier also merely received reprimands, and Gibson’s immediate superior officer had received a letter of admonition.

The court martial was controversial for several reasons. There was evidence that the U.S. Navy itself had put the Indianapolis in harm’s way, because Captain McVay’s orders were to “zigzag at his discretion, weather permitting.”

Then in what is perhaps one of the most surreal expert witness testimonies in history, the Navy actually called upon the captain of the Japanese submarine that had sunk the Indianapolis as a witness for the court martial! Mochitsura Hashimoto, the commander of I-58, testified that zigzagging would not have saved the U.S. Navy cruiser.

After the trial Fleet Admiral Chester Nimitz commuted McVay’s sentence and returned him to active duty. McVay went on to retire in 1949 as a rear admiral.

Many of the USS Indianapolis’s survivors said McVay was not to blame for the sinking, but some of the families of the dead were harsh: “Merry Christmas! Our family’s holiday would be a lot merrier if you hadn’t killed my son,” read one piece of hate mail. McVay’s guilt mounted until he committed suicide in 1968 at the age of 70, using his Navy-issued revolver. His body was discovered on his front lawn clutching a toy sailor in one hand.

In 1996, a sixth-grade student, Hunter Scott, began researching the sinking of the Indianapolis, leading to a U.S. Congressional investigation! In October 2000, the U.S. Congress passed a resolution stating that Captain McVay’s record should indicate that “he is exonerated for the loss of Indianapolis.” President Bill Clinton signed the resolution.

The resolution also noted that, while several hundred ships of the U.S. Navy had been lost in combat in World War II, McVay was unfairly the only captain to have been court-martialed for the sinking of his ship. In July 2001, the U.S. Secretary of the Navy cleared McVay’s official navy record of any wrongdoing.