Thirty-six miles is a remarkable distance for a ship supposedly doomed by the initial explosions.
It reinforces the progressive nature of the sinking.
The hull was not instantly destroyed.
The ship slowly lost the systems required to keep fighting the flooding.
Once propulsion failed, the destroyers tried to tow.
The difference in scale made this extraordinarily difficult.
Shinano's escorts could maneuver around her quickly, attack submarines, and rescue survivors.
They could not easily move a disabled carrier weighing tens of thousands of tons while it continued taking water.
Time had become the deciding factor.
The towing effort needed more time than the flooding allowed.
At 10:18, the battle to save Shinano effectively ended
The abandon-ship order came at 10:18 a.m.
By then, nearly seven hours had passed since Archerfish's attack.
This was not a panicked immediate evacuation.
Japanese personnel had spent most of the morning trying to save the carrier.
The order represented recognition that the ship's remaining stability could no longer be trusted.
Leaving a listing carrier is dangerous.
Decks become slopes.
Equipment breaks loose.
Men must climb across surfaces no longer aligned with gravity.
Boats may be difficult to launch from the high side and unusable on the low side.
People may jump directly into the sea.
Destroyers approaching to rescue survivors risk collision with the enormous damaged hull.
Around 10:57, Shinano finally rolled over and went down by the stern.
The largest carrier in existence disappeared less than a day after beginning what should have been a short transfer voyage.
The casualty figures reveal another cost of rushing the ship
Approximately 1,435 men were lost, while about 1,080 were rescued, according to the U.S. Navy's current historical account.
Not all those aboard were part of a mature combat crew.
Civilian technicians and shipyard personnel were present because construction remained incomplete.
Their presence complicated damage control and evacuation.
It also increased the human cost.
Had Shinano remained in a shipyard until completion, many of those civilians would not have been at sea during a submarine attack.
Again, strategic pressure had transferred shipyard conditions into combat waters.
The unfinished spaces and unfinished personnel arrangements were two parts of the same problem.
Archerfish became famous for one attack
Many submarines built wartime reputations across several successful patrols.
Archerfish's name became permanently attached to one target.
The sinking of Shinano gave the submarine a place in naval history disproportionate to a single night's duration.
The U.S. Navy recognized the patrol with a Presidential Unit Citation.
Enright received the Navy Cross.
Yet the submarine crew did not return home immediately understanding that they had destroyed a 72,000-ton converted Yamato-class carrier.
The full scale emerged only after the war.
This delayed recognition adds another extraordinary element.
The Americans achieved one of the largest submarine kills in history before they knew exactly what they had done.
Shinano remained secret even after sinking
Japan had guarded the ship's construction carefully.
The loss therefore did not immediately become a widely understood event.
American wartime intelligence lacked complete information.
Japanese secrecy continued to obscure the target's identity and characteristics.
Only postwar examination revealed the carrier's full story.
This secrecy had protected Shinano during construction.
After her loss, it created historical confusion.
Early accounts contained different displacement figures, different interpretations of the damage, and incomplete descriptions of her intended mission.
Postwar access to Japanese officers, designers, and investigation records gradually clarified the picture.
That process is why some historical details about Shinano vary between sources.
The core facts remain stable.
Third Yamato-class hull.
Converted after Midway.
Rushed toward completion.
Commissioned November 19.
Departed November 28.
Tracked by Archerfish.
Six torpedoes fired.
Four hits.
Progressive flooding.
Abandon ship.
Sunk November 29.
Largest warship sunk by a submarine.
The ship's immense armor became almost tragic excess
Shinano contained thousands of tons of armor intended to protect her from battle damage.
That armor had cost resources.
It had required engineering.
It contributed enormously to displacement.
Yet the final sinking was driven by water passing through spaces that should have been sealed.
This creates one of naval history's strongest examples of the difference between visible strength and system strength.
Armor is visible in specifications.
Seals are not.
A thick flight deck sounds impressive.
A properly fitted cable penetration sounds trivial.
During this disaster, the trivial detail became more important.
The lesson applies far beyond warships.