What kind of U-Boat is this?

[Bilge_Rat]

re: "The Cruel Sea", I just happened to read the novel for the first time a month ago. It was a real page turner, I could not put it down and read the whole thing in about a week. It is a classic, easily the best novel I ever read about the Allied side of the Battle of the Atlantic. Highly recommended.

On the movie, you have to remember it was made in the early 50s, so no CGI. The producers had a hard time even getting hold of a Corvette. The choice was either using a real RN sub or using models.