Part 1 of Essay
The pre-war issue torpedo had the disadvantage of leaving a visible trail of bubbles on the surface on its way to the target. The standard torpedo of the war suffered from early problems with its internal depth-keeping equipment, and its firing pistol, but these were solved after the Norwegian Campaign. In mid 1942 an im ....

Part 2 of Essay
.... escort and merchants to the end of the war though. The weapon was designed to lock onto the loudest noise after a run of 400m from its launch. This often proved to be the U-boat itself and standard issue-orders were to dive immediately to depth of 60m after launch from a bow tube while a stern shot was to be followed by a complete silence in the boat. Two U-boats were almost certainly lost when hit by one of their own T5 torpedoes, U-972 in Dec 1943 and U-377 in Jan 1944. Variants All the German U-boat to ....