Wow, I need to check that one
. Backwards. I tested and watch alot of torpedos trying to figure out the fast Mark14 speed bug, and the default Magnetic setting the torpedo would never explode if it went under the ship hull. They should be exploding anywhere under keel to 5.5 feet according to the .sim file.
That would explain why they are not exploding. Others have posted this. Well, lets go take a look.