I presume you're familiar with
The Enemy Below. Not only a fun movie presenting both sides of the battle (except these days I can't get away from that awful fake 'u-boat' interior). Still, one of the all-time greats.
http://www.amazon.com/Enemy-Below-Ro...7752582&sr=1-1
It was also the inspiration for the
Star Trek episode that first introduced the Romulans!
But back to
The Cruel Sea. I finally saw the movie for the first time while at the Houston Subsim meet back in October. I thought it followed the book nicely, but had to leave a lot out. I've also read
Monsarrat at Sea, a collection of short stories and actual wartime accounts from the author, who actually was the First Lieutenant in the book and film. Unlike his fictional counterpart, he went on to become a corvette captain in his own right.
Here's the review I wrote back when I read it:
http://www.subsim.com/radioroom/show...9&postcount=90