US didn't even know that carrier existed and it wasn't until the war ended the found out not only that it sunk, but how big it was.

And sunk just 10 days after being commissioned.

I remember reading a story about that in Reader's Digest when I was a kid. The captain was absolutely convinced that he had sunk a carrier, but the Navy didn't believe him at first because they didn't know this one existed.

Shinano was a death trap, and took over 1400 men with her to her watery grave.

To date, the wreck has never been found.

Still can't compare to sinking a fleet carrier and a destroyer ,severely damaging a battleship and barely missing a 2nd fleet carrier with one salvo

Who was that? The closest I can see are Barb and Redfish but they sank escort carriers.

The biggest "what might have been" if not for defective torpedos is Tunny. She got between the two columns of a convoy that had a carrier in one column and two escort carriers in the other. Tunny made 4 stern shots and heard 4 hits. This was followed by 6 bow shots with 3 hits heard. Only the Taiyo was damaged.

It was the other team. I-19 sank USS Wasp and USS O'Brien at Guadalcanal.

YZ250 said:

---

And sunk just 10 days after being commissioned.

---

before it even engaged in battle or had planes and armaments!

imagine the Japanese Navy, once the most powerful in the world in 1941 reduced to literally ZERO aircraft carriers by August 1945!

The US Navy had over 70!