From the book Submarine Diary by C. Mendenhall.
"..in late 1943 Hallibut sank a ship simply because wo dud torpedoes punched 21"inch holes in the side of a freighter.."
I am currently reading above book and when reading this about Hallibut I used that info the check the book "US Submarine Attacks During WWII" by John D. Alden. But unfortunately it did not any ships sunk in 1943 by Hallibut with duds :-(
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