Submarine books?
 

Are there any good books about submarines that are fictional and really just about a submarine? No scifi or WWII.

Plenty

Hunt for Red October
Tom Clancy SSN (most other Tom Clancy books)
War plan red
Thunder in the deep

To name a few

Thank you but which one would you recomment the most?

Check out the Jerry Mitchell series by Larry Bond, I found it to be very well written and gives what seems to be a fairly accurate and detailed glimps into the routine aboard a us navy submarine in a way that’s far from Boring.

Sounds like that's exactly what I was looking for, thx!

Hunt for red october defiantly then watch the film