The forward mooring lines were exactly where nobody could go.

That became a serious problem a few minutes after three o’clock on the afternoon of May 21, 1944, because several tank landing ships in Pearl Harbor’s West Loch were burning and the most useful thing some of their crews could have done was get away from the other ships.

They were tied to them.

West Loch held twenty-nine LSTs that afternoon, part of a larger group of ships being loaded for the invasion of the Mariana Islands. At several berths the landing ships were nested side-by-side rather than sitting alone. They carried ammunition, vehicles, fuel, Marines and soldiers. The Navy’s current history describes the arrangement in simpler terms: the ships were combat loaded and very close together.

At 3:08 p.m., something exploded aboard LST-353.

The investigation never established exactly what.

That uncertainty has survived for eighty-two years.

What happened next is considerably easier to reconstruct.

A ship designed to open at the front

An LST was built around an odd requirement.

It had to cross an ocean and then behave, briefly, like part of a beach.

Large bow doors opened. A ramp came down. Tanks, trucks, artillery and men drove directly out. In November 1943, LST-353 had done exactly that at Bougainville; a surviving Navy photograph shows Marines wading away from the ship through waist-deep water.

Seven months later the same vessel was back at Pearl Harbor preparing for another amphibious operation.

Saipan was scheduled for June 15.

West Loch had become one of the places where the machinery for that invasion was being assembled, which meant the LSTs were serving another role for which their basic design was extremely useful and potentially unpleasant: floating warehouses.

Vehicles carried ammunition.

The ships carried their own fuel.

Aviation gasoline was stored in drums.

Ammunition was being moved on and off the vessels as plans changed.

People slept, worked, repaired equipment and waited aboard them.

The temporary loading arrangement had compressed a large amount of combustible material into a relatively small piece of harbor.

Nothing had gone wrong yet.

The mortar rounds were coming back off

One of the details inside the first explosion is easy to lose because the fire that followed was so much larger.

Mortar ammunition was being removed from an LCT carried aboard LST-353. The mortars had performed poorly when fired from the landing craft during training, so the ammunition was being transferred back. NHHC’s later review says the stevedores doing that work had received no special training for the task.

Nearby were drums of high-octane aviation gasoline.

There had also been welding aboard the ship.

Witnesses reported people smoking despite restrictions.

That creates a temptation to solve the mystery.

A cigarette ignited gasoline vapour.

A welder supplied the spark.

Someone dropped a mortar shell.

Take your pick.

The Navy inquiry could not.

The Board believed a mortar round probably detonated first, either after being dropped or after a gasoline fire reached it, but nobody close enough to see the initiating event survived to describe it. NHHC still says there is no consensus on the exact cause.

Final Vestige does not gain anything by choosing for them.

There were enough documented hazards without inventing the last few seconds.

Three minutes

The first blast threw shrapnel and burning debris across the berth.

Men went into the water.

Gasoline spilled and burned on its surface.

Fires appeared aboard neighboring ships.

Some LSTs at the next berth began trying to leave.

Then, only about three minutes after the first explosion, a second and larger blast hit. A third major explosion followed as burning ships began moving, intentionally or otherwise, around West Loch. Debris came down across roughly a 3,000-foot radius, according to the Navy’s reconstruction.

That is when the mooring arrangement stopped being a background detail.

On ships nearest the fire, crews could not reach the forward lines because the heat and flames had already driven them aft.

The lines keeping one ship beside another were now located inside the part of the ship they could not enter.

Some lines were cut.

Some ships managed to pull away.

Others drifted.

The distinction mattered enormously.

A burning ship can still travel

One of the LSTs from the first berth drifted toward T-9.

It arrived burning.

The fire spread to another landing ship there.

This is the piece of West Loch that interests me most.

We tend to imagine a chain reaction as something happening chemically inside ammunition. One explosive item ignites another, which ignites another.

West Loch developed a second kind of chain reaction.

The ships themselves moved the fire.

Three burning LSTs eventually drifted toward the Naval Ammunition Depot at the southern side of the loch. They were still exploding as they moved. The depot personnel could do little except watch the distance close.

The ships stopped about 500 feet short.

Five hundred feet is an insignificant distance in a harbor.

That afternoon it was enough.

The ammunition ship had its own problem

At the depot, the cargo ship Joseph B. Francis was unloading roughly 350 tons of ammunition.

A phosphorus shell thrown out of the West Loch explosions landed on the ship and ignited.

Its crew put the fire out.

The shell reignited.

They put it out again, then got the ship clear.

There is no useful way to turn that into a larger speech about courage.

A loaded ammunition ship sat beside an ammunition depot while burning landing ships drifted toward it.

The crew had a fire aboard.

They extinguished it twice and left.

That is enough.

The water became part of the fire

Small boats moved through the smoke looking for men who had been blown or forced overboard.

Visibility could become almost useless.

Paul Cooper, a Marine aboard one of the nearby LSTs, later remembered rescue craft sometimes having difficulty seeing people in the water. In the confusion, some men were struck by boats trying to save them.

Fire pumps came from East Loch.

Fireboats started toward Pearl Harbor from Honolulu Harbor, about fourteen nautical miles away.

Tugs tried to separate burning ships while other craft sprayed water into hulls loaded with ammunition that continued to cook off.

The salvage ship USS Valve spent four hours fighting the fires before the exploding ammunition forced her away. She returned on May 23 and extinguished another fire aboard the wreck of LST-480.

The accident did not end when the major explosions stopped.

LST-39 caught fire again late that night.

LST-480 reignited after midnight.

Some of the hulks continued burning for days.

Six ships

When it was over, six LSTs had been destroyed:

• LST-39.
• LST-43.
• LST-69.
• LST-179.
• LST-353.
• LST-480.

Three LCTs and seventeen amphibious tractors were also lost, along with artillery, vehicles and other equipment intended for the Pacific offensive. Two additional LSTs were damaged too badly to take part in the Saipan invasion.

The Navy’s conventional figure is 163 killed and 396 injured, but NHHC cautions that the historical accounting is incomplete. Navy, Marine and Army personnel were mixed through the operation, Army stevedore losses were especially difficult to reconstruct, and many units dispersed soon afterward. The 163 figure remains the standard Navy count, not a perfectly reconciled total across every service.

The invasion still left

The Pacific war did not wait for West Loch to finish burning.

Replacement landing ships were found.

Equipment was reassigned.

Personnel were reorganized.

The surviving invasion force departed Pearl Harbor only about a day later than planned, and the Saipan operation proceeded on schedule.

That fact is usually presented as evidence of impressive American logistical depth.

It is.

It also explains something about why West Loch became difficult to remember cleanly.

The people who had just survived the accident did not remain together for months while somebody reconstructed every personnel roster.

Many of them sailed to another disaster.

This one had an enemy.

The photograph from above

The strongest photograph of West Loch was taken from the air.

Smoke rises from T-8 and T-9 in one dense black mass. A few LSTs are already moving across open water. Others remain near the burning berths.

Once you know what happened, the photograph becomes a map of decisions.

That ship has gotten away.

That one has not.

Those ships are still close enough that the fate of one can become the fate of another.

The photograph does not show the mooring lines.

It shows what the lines meant.

The first cause stayed uncertain; the unsafe arrangement did not

The inquiry could not tell the Navy exactly what supplied the first spark.

It could still identify a considerable number of things that had made the consequences worse.

Ammunition handling was taking place around gasoline.

Smoking prohibitions were not being reliably obeyed.

Welding had been occurring.

Inexperienced personnel were moving ordnance.

Combat-loaded LSTs had been nested closely enough that one vessel’s fire could rapidly become several vessels’ fire.

This distinction matters.

An investigation does not have to solve the first millisecond of a catastrophe before it can learn something from the next six hours.

Along with the Port Chicago explosion two months later, West Loch contributed to a major overhaul of Navy ammunition-handling procedures and training.

There is a natural Final Vestige connection here to They Thought They Had Ten Minutes, the USS Forrestal story.

Twenty-three years later, the technical details would be very different: aircraft, rockets, bombs, fire on a carrier deck.

The institutional problem was familiar.

Ordnance safety is not knowledge an organization acquires once.

LST-480 stayed

Most of the destroyed ships disappeared through salvage and cleanup.

LST-480 did not entirely go away.

Its burned hull was grounded at Intrepid Point during the disaster. Contemporary Navy photographs show the ship with severe damage to both its after section and starboard bow, with Coast Guard cutter Woodbine working near the stern.

Part of the wreck remains off Waipio Peninsula.

Commander, Navy Region Hawaii still describes the rusting hulk as the surviving physical reminder of the disaster. A Navy/National Park Service wayside exhibit was established across from it in 1994.

An NHHC archaeological assessment goes a little farther. It argues that the LST-480 site may still have substantial archaeological value precisely because so much material was lost there and the area saw relatively little later disturbance.

The harbor kept one piece.

The cemetery kept others.

Eight caskets

In October 2024, personnel from the Defense POW/MIA Accounting Agency went to the National Memorial Cemetery of the Pacific and opened the West Loch story again.

They disinterred the first eight caskets of unidentified service members associated with the disaster.

The purpose was simple enough to describe and difficult enough to have taken eighty years: use modern DNA, dental, anthropological and historical evidence to give names back to remains buried as unknowns.

DPAA said that more than half of the soldiers still unresolved in its West Loch project were African American members of the 29th Chemical Decontamination Unit. By 2024, family-reference DNA had become available for 73 percent of the unresolved casualties in the project, making a systematic disinterment effort practical.

That is a different kind of aftermath than a safety regulation.

The fire changed procedures.

DNA changed what could still be known about the people.

Roy Reed

On April 29, 2026, DPAA announced that Marine Corps Reserve Corporal Roy L. Reed, twenty-four years old when West Loch killed him, had been accounted for on March 24.

Reed had been assigned to B Company, 2nd Amphibious Tractor Battalion, 2nd Marine Division.

He was aboard LST-353.

After the explosions, he could not be found. The wartime paperwork listed him simply as killed in an explosion.

Eighty-two years later, that line changed.

I would not use Reed to manufacture a neat ending for West Loch.

There are still unresolved families.

DPAA’s work continues.

The cause of the first blast is still uncertain.

The casualty accounting is still more complicated than a single engraved total suggests.

But one man who vanished from LST-353 now has his name attached to the evidence again.

The lines

The first explosion gets most of the attention because every catastrophe invites the same question.

What started it?

West Loch never gave investigators a clean answer.

The more useful evidence begins a few seconds later.

Ships full of fuel, ammunition and people needed distance from one another.

Some crews could not create it because the lines holding the ships together ran through fire.

Others got loose and carried the fire somewhere else.

For a few hours in West Loch, the Navy discovered that separation was not merely something you wanted between explosives.

It was something you needed between ships.

The lines were in the fire.

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Sources & Further Reading

• Naval History and Heritage Command, “Pearl Harbor Ablaze Again: The West Loch Disaster.” The strongest current narrative synthesis of the explosion sequence, inaccessible mooring lines, drifting burning LSTs, rescue effort, casualty-accounting problems and the uncertain initial cause.
• NHHC, “H-029-5: A Brief History of Major U.S. Navy Ordnance Accidents.” Useful for the mortar-transfer operation, aviation gasoline, welding, smoking reports, inquiry findings and the safety reforms associated with West Loch and Port Chicago.
• Commander, Navy Region Hawaii, “West Loch Disaster.” Current official site history covering the nested loading arrangement, conventional casualty figures, invasion timetable and the surviving LST-480 wreck.
• NHHC, USS Valve ship history. Operational context for four hours of firefighting and the return to LST-480 on May 23.
• Defense POW/MIA Accounting Agency, “A Search for Answers: DPAA Begins Disinterment of West Loch Disaster Unknowns.” Source for the modern identification project, the first eight disinterments, family-reference DNA status and unresolved casualties.
• Defense POW/MIA Accounting Agency, “Marine Accounted For From World War II (Reed, R.).” April 29, 2026 announcement identifying Corporal Roy L. Reed, who disappeared aboard LST-353 during the disaster.