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On The Bottom! Way to necro a sunk submarine thread after 11 years. https://www.livescience.com/66099-ww...ine-found.html vs https://www.legion.org/library/9370/...ry-solved-last

An account by a Japanese officer aboard the freighter Kano Maru claims that after being torpedoed by a submarine north of Kiska, Alaska, the crew saw ripples in the water, fired their deck guns and hit its conning tower.

“We originally thought a 3-inch shell had hit the shears, the supports that hold the periscope,” Bruce says. “Recently, though, we met Cmdr. Charlie Tate, who did eight war patrols on Gato, a sister ship of Grunion. He told us the damage to the shears was almost certainly not caused by a 3-inch shell, but by something larger. Right now the hypothesis we are leaning toward is that it was a circular torpedo that did not explode.”
If that’s the case, Kano Maru actually shot at a washing wave caused by the bubble that rose to the surface when Grunion imploded. A jammed rear dive plane combined with a disruption would have left the submarine unable to blow its forward ballast tanks and falling fast.
In August 1942, the Navy recognized Grunion as missing. The Abeles never even got to say goodbye to their father, whom everyone, even his sons, affectionately called “Jim.” He took them to lunch at the Officers’ Club at the submarine base in Groton, Conn., before saying he had work to do. That work was a classified mission in the North Pacific.