This ship's story isn't unusual. Every ship during WWII was a safety nightmare. Fratricide was common. So too were dangerous navigation errors. Every weapon system was one checklist item away from a deadly mistake (ie torpedo primers being the only safety mechanism during a drill). We wax nostalgic for all the heroes of WWII, but by today's standards a WWII crew was a bunch of under-trained kids manning extremely dangerous equipment. Such are the needs of war.
Once upon a time every military asset operated with live rounds. There were no "training" rounds in wartime. What happened in the OP was someone missed a step in an otherwise very normal drill. Want to really scare yourself? Google around for "broken arrows", live nuclear weapons that went missing. Most all of them were live rounds being carried during training. Something went wrong and that live nuke ended up in a field or at the bottom of a lake.
