Australia May be Close to Solving WWI Sub Mystery

There seem to have been a rash of WWI/WWII submarine findings in the past few years. In addition to the one mentioned here, these are the ones I know about:

USS Lagarto, Lost May 1945, Found April 2005, Gulf of Siam

USS Grunion, Lost July 1942, Found August 2006, Aleutian Islands

USS Wahoo, Lost October 1943, Found August 2006, Sea of Japan

H11 (British), Lost 1920, Found July 2006, Off Eyemouth Scotland

Midget sub (Japanese), Lost 1942, Found November 2006, Off Sydney Australia

Midget Sub (Japanese), Lost Dec 7, 1941, Found August 2002, Off Pearl Harbor

At the begining of the US entering the war with Japan the American subs were outfitted with old torpedos. When they fired at a ship they would not explode. The shear pin in the nose had age hardened over the years to a level that kept them from shearing. Several US subs were lost, since once the topedo was fired the enemy ship had a clear view of where the sub is. My father was a heat treater at Quonset Naval Air Station in Rhode Island and worked with an Ensign (a genious type) who determined the problem and solved it. Back then metallurgy was a craft not a science, well I don't think it is a science even today.