Frisen
USS Coranado AGF-11
Nobody. The submarine was captured before it was sunk.
None, the Wilhelm Gustloff was sunk by the Sovet Union ( S-13 )
Submarines do get sunk in the sea.
The USS Housatonic, sunk by the Confederate submarine CSS Hunley.
Lusitania
Yes
German submarine ;
Germany practiced unrestricted submarine warfare.
It sunk in 1942
USS Thresher
Lusitania wasn't a German submarine, it was an American merchant ship that was sunk by German submarines.