Das Boot has been available on DVD for more than a decade. You can get the Director's Cut, which at 3-1/2 hours is an hour longer than the theatrical release, and has better sound and very good subtitles, or you can go for the 'Original, Uncut Version', which is the miniseries without the episode dividers, and is just under 5 hours long. The sound and subtitles aren't as good in that one, but the extra footage makes it the one to own.
http://www.amazon.com/Das-Boot-Direc...1933011&sr=1-1
http://www.amazon.com/Das-Boot-Origi...1933011&sr=1-2
Browncoat, huh?
Oh, and WELCOME ABOARD!