I own a couple of Edward Beach books Submarine being one of them have read it twice. Great novel. Also the more well known one RSRD, and another good read is 'Around the world submerged' about the voyage of the Nuclear powered submarine USS Triton captained by Beach.
Last few days ive been reading 'Night of the Uboats' by Paul Lund & Harry Ludlam this time its the Merchantmen story, pretty grim reading.