Subnets,appear to be made of substatial chain links connected in a heavy mesh,hung from submereged bouys.I don't know why,but if you set depth under keel,for target magnetic pistol your fish explodes on impact with net,Why then,if at all stop,could you not fire second fish through first hole? Surely it makes a hole?Come to PD.set torp.run depth to 1m. impact.navagate to best broadside position AOA(angle of attack) It took 3 fish for a tanker someplace,can't remember! Youall can see,I love port raiding beware of mines,save before getaway,incase you don't!