[mollynme]

I noted the sunken subs hatch was open in one of the photo’s.

There is a translation of a Japanese report of contact with the Grunion here which could explain that.

[Bubba Ho-Tep]

Sounds like those bum torpedoes we used early the war were responsible for her loss. The first torpedo crippled the Japanese ship, but two subsequent ones hit the target but didn’t explode. The Grunion came up to use her deck gun, but the Japanese ship got in a lucky shot that hit her conning tower.