Destroyers that had been assigned to escort her were rescuing survivors.
Archerfish was escaping underwater.
Enright did not yet know the name of his target.
Captain Abe remained with his ship.
The huge flight deck disappeared.
The armored Yamato-class hull followed.
Thousands of tons of steel entered deep water because four torpedo explosions had started a process nobody aboard could stop.
The ship did not fail because 72,000 tons were somehow too little.
She failed because those tons could no longer be kept buoyant.
The deeper lesson survived even though Shinano did not
Large weapons attract attention.
Large ships attract attention.
Armor thickness, gun caliber, aircraft capacity, displacement, and speed are easy to compare.
The things that keep damaged ships alive are often less impressive on paper.
A closed hatch.
A trained repair party.
A working portable pump.
A sealed cable penetration.
An accurate damage report.
A captain willing to slow down.
A crew that has practiced the same emergency enough times to respond automatically in darkness.
Those details do not make impressive propaganda photographs.
They decide whether ships come home.
Shinano never had enough time to make them routine.
Archerfish arrived before routine could exist.
The carrier's sinking became the final proof that displacement is not survivability
A 72,000-ton ship contains enormous reserve buoyancy.
That reserve bought Shinano almost eight hours.
It allowed her to continue steaming after four torpedo strikes.
It allowed officers to believe the damage could still be managed.
It gave damage-control teams time to fight.
It allowed escort destroyers time to attempt towing.
Size did all of those things.
What size could not do was replace boundaries.
When enough internal volume filled with water, the mathematics became unavoidable.
The ship could no longer support its own weight in a stable position.
Seventy-two thousand tons did not disappear.
They rolled over.
Archerfish had fired at a carrier but had actually attacked a schedule
In another sense, the submarine's target was not only Shinano.
It was the Japanese decision to save time.
The rushed commissioning.
The unfinished pumps.
The incomplete seals.
The lack of crew training.
The workers still aboard.
Every shortcut had been taken because the war was moving faster than the shipyard.
Enright's torpedoes turned those saved days into lost compartments.
The time Japan had refused to spend before departure had to be paid during the emergency.
There was not enough time left.
The sea exposed every unfinished job at once
A shipyard worker can leave a penetration unfinished and plan to return tomorrow.
The sea does not recognize tomorrow.
A pump can be scheduled for installation next week.
Flooding does not recognize next week.
A crew drill can be postponed until after arrival at Kure.
A torpedo does not recognize the training calendar.
This is why the sinking feels almost cruelly precise.
Every unfinished task suddenly became urgent at 3:09 a.m.
The carrier needed all of them completed simultaneously.
They were not.
By the time Shinano disappeared, Archerfish had already left the scene
The submarine could not watch the whole disaster.
Enright's priority after firing was survival.
The destroyers represented immediate danger.
Archerfish went deep.
The Americans heard explosions and breaking noises but had no complete view of the progressive flooding above.
This separation between attacker and target is characteristic of submarine warfare.
A torpedo attack may be over for the submarine long before the target's damage-control battle ends.
Enright's crew moved away.
Shinano's crew fought for hours.
Two completely different battles followed the same six torpedoes.
Archerfish fought to escape.
Shinano fought the sea.
The submarine won first.
The sea won second.
After the war, the two stories finally became one
American investigators gained access to Japanese records and survivors.
They learned the identity of the target.
They learned how incomplete the carrier had been.