[Dan D]

Originally Posted by Bellman

Only once have two submarines duelled to the death. In February 1945 HMS Venturer hunted down and sank the U-Boat U864, a craft on a deadly secret mission.
http://www.bbc.co.uk/history/program...imewatch.shtml

Happy new year and all.

HMs Venturer vs. U 864 =
"This is the only known incident in all of naval warfare in which one submarine sinks another while both are submerged." (quote u-boat.net).

Subs sinking subs, that happened more than once in WWII.
example:
http://www.dutchsubmarines.com/speci..._moonlight.htm
Drebbel*s page.

More subs sinking u-boats:
http://uboat.net/fates/sub-sunk.htm