Alright, testing works! I fired torpedo at NLL ship (GR2) with magnetic detonator turned on. As soon as the torpedo was under the keel kaboom! Now I wanted to see if I switched off the magnetic detonator what would happen. So with magnetic detonator turned off I fired another torpedo at NLL. Torpedo passed under keel without exploding
I fired another torpedo at NLL this time with depth set to 1m (surface). Torpedo exploded on impact with ship.
Did all the same tests with dat style units and they passed also. Look for release here very soon!