Mysterious Impact
Japanese ships saw a torpedo attack in August of 1943 and the day after, a surfaced submarine was seen. Not much data exists other than: “(the Japanese) noted an impact with a submerged object.”
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We’ll Never Know
If she survived, then no other ship attacks could have sunk her. We don’t know if she went down due to an unrecorded attack or because of operational reasons. I guess we’ll never surely know.