At this time in the war, American anti-sub warfare was very primitive. Not sure if they even had sonar yet. Which makes the sinking of this sub by Captain Claudius and crew even more a great accomplishment. The article says they apparently didn’t just drop a depth charge somewhere near the sub to do it in either, they dropped it right on it! A rare thing - even later on in the war when they had much improved ASW gear. A needle in a haystack thing.
Claudius almost ran over the sub’s periscope. He was escorting the Robert E. Lee, a passenger ship. The PC-566 displaced only 280 tons (not all that much bigger than the Mayflower, easy to ignore). The German apparently did not dive until Claudius was almost on top of him. Claudius rolled one four depth charge pattern on the German, turned around and dropped one more similar pattern, saw oil coming up, broke off the engagement and began rescuing survivors of the Robert E. Lee.
One thing the military is famous for is crucifying its own. Not just the US military, all of them since Grog strapped a rock to the end of a club. Grog was drummed out of the warrior circle for being “fanciful and not rooted in the traditions of his order”.