I read "Iron Coffins" several years ago - and loved it. Being a big sub lover since the 50's, I don't care if the uh, facts, are sometimes skewed. If the story grips me and keeps me reading I consider it a "good read".
Oh, and my first sub book was "The Real Book About Submarines" which I took out from my grammar school library.
I just found it on eBay about six months ago and bought it. I re-read it and enjoyed it just as much now as I did 50 years ago. Of course, technology has moved along just a bit since then...