The Secret Mission
On July 16, 1945 — the same day the Trinity test lit up the New Mexico desert and proved the atomic bomb would work — the heavy cruiser USS Indianapolis departed San Francisco's Hunters Point Naval Shipyard carrying the most classified cargo in American military history [1]. Welded to the deck of the port hangar was a large metal canister. Secured below in a lead-lined bucket was the enriched uranium-235 projectile core for "Little Boy," the atomic bomb that would be dropped on Hiroshima less than three weeks later [2]. The ship's crew — 1,196 men — did not know what they were carrying. They were told only that the canister must never touch the deck if the ship went down, and that if the ship sank, the canister was to go into a lifeboat before any sailor.
Captain Charles Butler McVay III, a well-respected career officer and son of an admiral, knew only that the cargo was of supreme importance and that he was to deliver it to Tinian Island in the Pacific at maximum speed. He was told that every day the delivery was delayed could mean the war would last that much longer [1]. The Indianapolis — a Portland-class heavy cruiser that had served as President Roosevelt's "Ship of State" and earned ten battle stars across the Pacific campaigns — was chosen precisely because of her speed. She could make over 32 knots.
The Indianapolis made the 5,000-mile voyage in ten days, stopping briefly at Pearl Harbor before continuing west. She arrived at Tinian on July 26. The uranium was offloaded and rushed to the assembly team already on the island. Within eleven days, "Little Boy" would be dropped on Hiroshima, killing an estimated 80,000 people instantly and hastening the end of the war. The mission was complete — and it remains the single most consequential cargo delivery in naval history [2].
Captain McVay then received orders to proceed to Leyte Gulf in the Philippines to join a task force preparing for the invasion of Japan. He requested an escort. The request was denied — he was told the route was safe [4].
He sailed alone.
The Sinking
At 12:14 a.m. on July 30, 1945, two torpedoes from the Japanese submarine I-58, commanded by Lieutenant Commander Mochitsura Hashimoto, struck the Indianapolis on her starboard side [1]. The first hit the forward magazine near the bow, igniting aviation fuel and stored ammunition in a massive fireball that blew the bow nearly off. The second struck amidships near the engine rooms, severing the ship's power, communications, and propulsion in a single blow. The Indianapolis was making 17 knots at the time of impact, and with no power to stop engines, she continued plowing forward, scooping seawater into her shattered hull [3].
The ship listed heavily to starboard within minutes. Men below decks were trapped by buckled hatches, rising water, and burning fuel. The distress signal was keyed out by radioman Elwyn Sturtevant, but with electrical power failing and antennas damaged, it was never confirmed as sent or received [2]. Captain McVay, thrown from his bunk by the first explosion, made his way topside and gave the order to abandon ship. But the Indianapolis was already rolling over.
She sank in twelve minutes — so fast that there was no time to launch most of the lifeboats. Of the ship's 35 life rafts and numerous lifeboats, only 12 rafts were deployed. Men leaped into water slicked with burning fuel oil, grabbing at debris, floater nets, and each other in the darkness of the open Pacific [1]. Most wore only kapok life vests, many of which had been poorly maintained and would become waterlogged within 48 hours.
Of the 1,196 crew aboard, approximately 900 made it into the water alive. The rest — roughly 300 men — went down with the ship, trapped below decks or killed by the explosions.
No one was coming. No one knew they were there.
Four Days in the Water
The survivors spent approximately 96 hours — four full days and nights — adrift in the open Philippine Sea before rescue [1]. What followed is among the most harrowing survival stories in naval history and the worst shark attack on human beings ever recorded.
The men were scattered across miles of ocean in loose groups, some clinging to rafts, most floating in vests with nothing beneath them but 12,000 feet of water. They had almost no fresh water and virtually no food. Dehydration and exposure began killing men within the first day [2]. The tropical sun blistered exposed skin raw during daylight hours. At night, despite sea surface temperatures near 85 degrees, the constant immersion drained body heat, and hypothermia set in. Men shivered uncontrollably and lost consciousness.
Saltwater ingestion became the greatest killer after the first 24 hours. Desperate with thirst, men drank seawater despite warnings. The salt triggered rapid delirium — hallucinations of islands, rescue ships, freshwater springs just below the surface. Delirious men swam away from groups toward phantom land, removed their vests, and drowned. Others became violent and attacked fellow survivors, convinced they were Japanese soldiers or that their shipmates were hoarding water [1].
And then the sharks came.
Oceanic whitetip sharks — aggressive open-water apex predators that grow up to 11 feet long and are drawn to disaster debris — found the survivors within hours of the sinking [3]. Unlike most shark species, oceanic whitetips are bold, persistent, and unafraid of humans. They circled the groups constantly. Survivors described feeling the rough skin of sharks brush against their legs, followed by exploratory bumps, and then — without warning — attacks.
The sharks pulled screaming men beneath the surface. They struck at the wounded first, drawn by blood trails from shrapnel injuries and burns sustained during the sinking. But they did not stop at the dead and wounded. Living, uninjured men were taken in broad daylight. Survivors formed tight circles, kicking outward to fend off attacks, but the sharks returned constantly, especially at dawn and dusk when feeding activity peaked [3]. Dr. Lewis Haynes, the ship's senior medical officer who survived, later estimated that sharks killed between 50 and 80 men — though some historians believe the true number could be higher, as many disappearances in the water went unexplained [1].
By the second and third days, the death toll was staggering. Men died from injuries, exposure, dehydration, salt-water psychosis, shark attacks, and drowning at a rate of dozens per hour. Some simply slipped out of their deteriorating vests and sank. Group leaders like Marine Captain Edward Parke physically held dying men above water until Parke himself succumbed to exhaustion and drowned [2]. The living stripped vests from the dead. Chaplains prayed over men who died in their arms and then released them to sink.
Why No One Came
The Indianapolis was never reported overdue. This catastrophic failure — the one that transformed a wartime sinking into an unprecedented mass-casualty disaster — had multiple causes, each compounding the next [4].
The ship had been traveling alone, without escort, and the Navy's system for tracking individual vessels in the vast Pacific theater was disorganized in the final frantic months of the war. A directive known as "Routing Instructions" was in effect that explicitly stated port directors should not report combatant vessels as overdue — the assumption being that warships might divert for operational reasons without notice [2]. The port director at Leyte Gulf was therefore not required to note the Indianapolis's failure to arrive. When it didn't show up on July 31, no one raised an alarm. No one asked where it was. The system was designed to let ships disappear without comment.
A distress signal may have been transmitted during the sinking, but the three shore stations that reportedly received fragments of the message either dismissed them as Japanese deceptions — a known tactic — or failed to act [4]. One watch officer was reportedly drunk. Another assumed it was a trick. A third received the message and simply did not pass it up the chain of command. None of the three initiated a search.
The men in the water were found purely by accident on August 2, when Lieutenant Chuck Gwinn, flying a PV-1 Ventura on a routine anti-submarine patrol, spotted an oil slick stretching across the sea [1]. He dropped lower to investigate, expecting to find a Japanese submarine. Instead he saw dozens of human heads bobbing in the water — tiny dark specks in an ocean of blue. Gwinn immediately radioed for help and dropped life rafts and supplies.
The destroyer USS Cecil J. Doyle was the first rescue ship to arrive, followed by several others. Lieutenant Commander W. Graham Claytor Jr., captain of the Doyle, made the controversial decision to turn on his ship's searchlights despite the risk of submarine attack — a decision that saved lives by guiding swimmers toward the ship in the darkness [2]. Rescue operations continued through the night and into the next day.
Of the approximately 900 men who had entered the water four days earlier, only 316 were pulled out alive. Many of the survivors were blinded by fuel oil, covered in saltwater ulcers, and so dehydrated that their tongues had swollen to fill their mouths.
The Court-Martial
In November 1945 — just weeks after Japan's surrender — the Navy court-martialed Captain McVay on two charges: failing to order zigzag maneuvers, which might have made the ship harder to torpedo, and hazarding his vessel through negligence [4]. He was the only captain in U.S. Navy history to be court-martialed for losing a ship to enemy action in wartime. Of the nearly 700 American ships lost during World War II, not a single other captain was prosecuted.
The trial was extraordinary — and widely seen as a scapegoating exercise. Fleet Admiral Chester Nimitz had recommended against prosecution. So had many senior officers who understood the Navy's own culpability in the disaster [2]. But Chief of Naval Operations Admiral Ernest King overruled Nimitz and ordered the court-martial forward, reportedly to deflect congressional scrutiny from the Navy's failure to track and rescue the ship.
The prosecution's star witness was Mochitsura Hashimoto, the commander of the I-58 — the very submarine that had sunk the Indianapolis. It was the first time in American military history that an enemy combatant was called to testify against a U.S. officer. Hashimoto testified that zigzagging would not have prevented his attack — he had a clear firing solution and would have hit the Indianapolis regardless of her course [2]. His testimony effectively dismantled the Navy's own primary charge.
Despite this, McVay was convicted of failing to zigzag. He was acquitted on the more serious charge of hazarding his vessel, but the conviction carried a sentence of reduction in rank and seniority. The Secretary of the Navy later remitted the sentence on Nimitz's recommendation, but the conviction stood.
The verdict was controversial from the start. Many officers and all of the surviving crew believed McVay was being punished not for his own failures but for the Navy's systemic catastrophe [3]. The Navy had given McVay incomplete intelligence about submarine activity along his route — intelligence that was available but not shared with him. The Navy had denied his request for a destroyer escort. The Navy had failed to notice when he didn't arrive. And the Navy had ignored distress signals that could have saved hundreds of lives.
McVay was the scapegoat for all of it.
McVay's Fate
McVay was restored to duty and eventually promoted to Rear Admiral before retiring from the Navy in 1949 [1]. But the court-martial defined the rest of his life. He carried the guilt of 879 dead men — a burden the Navy had officially and publicly placed on his shoulders.
For more than twenty years, he received hate mail from families of the dead. Letters arrived at his home blaming him personally for their sons' and husbands' deaths, accusing him of murder, calling him a coward [4]. The letters came at holidays, on anniversaries of the sinking, and at random — a relentless reminder that the Navy and the public held him responsible.
His surviving crew did not. The men of the Indianapolis defended McVay fiercely for the rest of their lives, insisting he had been wronged. But their voices were not enough.
On November 6, 1968, at his home in Litchfield, Connecticut, Charles Butler McVay III walked onto his front porch with his Navy-issued .38 caliber service revolver [1]. In his other hand, he clutched a small toy sailor — a keepsake. He shot himself on the front lawn. He was 70 years old.
Exoneration
In 2000, after years of campaigning by survivors and their families — and an effort led by Hunter Scott, a 12-year-old Florida student who had written to senators after becoming obsessed with the Indianapolis story from watching the movie *Jaws* — Congress passed a joint resolution stating that McVay's court-martial record was unjust and that his record should reflect his exoneration [4]. The resolution noted that McVay's conviction was "morally unsustainable."
The Navy officially struck the conviction from McVay's record in July 2001. Secretary of the Navy Gordon England directed that all official references to the court-martial reflect that "Captain McVay's record is now clear."
The resolution came 32 years after McVay's suicide — and 55 years after the sinking.
The Memorial
The USS Indianapolis National Memorial was dedicated on the downtown canal walk in Indianapolis, Indiana, in 1995 — the 50th anniversary of the sinking [2]. The memorial lists the names of all 1,196 crew members engraved in granite. Each August, a ceremony is held to read the names aloud.
The wreck itself was located in August 2017 by a civilian research vessel funded by Microsoft co-founder Paul Allen, resting 18,000 feet below the surface of the Philippine Sea in one of the deepest ocean trenches on Earth [2]. The images showed the ship largely intact on the ocean floor, her bow separated from the hull exactly as survivors had described.
Of the 316 survivors, only a handful remain alive today. They held reunions in Indianapolis every few years — fewer men each time — to remember the ship, the mission, the water, the sharks, and the captain they always believed was wronged.