According to the web page of the Naval Historical Center, http://www.history.navy.mil/faqs/faq39-1.htm#anchor521073
the only U.S. submarine confirmed sunk by another sub was USS CORVINA (SS-226), on 16 November 1943.
Other sinkings of U.S. submarines potentially attributed, but unconfirmed, to submarines include:
USS KETE (SS-369) on 20 March 1945
USS SNOOK (SS-279) on 9 April 1945
54
Submarines do get sunk in the sea.
The British lost 76 submarines during WWII.
Counting warships & merchantman, US subs sunk about 1,000 vessels.
4,837
One accidental loss in the Atlantic; and 51 other subs sunk through out the Pacific; from south of the equator all the way towards Alaska and Japan.
It was sunk by German u-boats (submarines).
None beause they are all sunk in the sea because china are poor :P
109 ships of 593,864 tons in Atlantic
There were no submarines sunk or damaged during the attack on Pearl Harbor; all vessels either sunk or damaged were capital ships (battleships, cruisers, etc.) or support vessels (tenders, tugs, etc.).
Mercury used as ballast
The Lusitania.