seen this movie several times since 1985, when watching the tv-version as a child. this was a magic moment...when my parents left me home and letting me watch tv. and there was this great and unforgetable movie "Das Boot". Afterwards i got the book "Iron coffins" from Herbert A. Werner and my uboat frenzy started.
I guess it is not available in english, but i recently bought my copy of a book called "The search for the crew of U-96" (Die Suche nach der Crew von U-96, which is a "catalog" with 300 sites from the german film-museum. There was a fair in this museum, called "Das Boot revisited" with all kind of photos, relics, requisites, etc. shown from the film.