was rammed by Hamburg, cutting the torpedo boat in two just aft of S21s bridge. The stern half of S21 remained afloat for some time, but attempts by the other two torpedo boats to take it in tow failed and the remains of S21 sank. 36 men were killed in the sinking of S21. Notes References Bibliography Torpedo boats of the Imperial German Navy 1913 ships World War I torpedo boats of Germany V1-class destroyers Ships built in Elbing Ships built by Schichau