It is a fun pulp adventure action movie, but if you expect realism you gotta stop there. As far as I know it was all inspired by old serial shows and pulp stories from magazines. Ya gotta just let certain stories be fun. Though as a geek it is fun to rag on their issues I know, have done that lots.

But yes seemed silly he hung on the uboat that long, I wondered about it growing up since was a regular watched movie, that was a long freaking trip to be hanging regardless of food service and comfort.