[mmm...Dönitz]

Maybe I'm setting the depth too low. Thing is that when attacking very large targets with eels at 3m depth I found that they took best part of an hour to sink. I then changed the depth to about 7m on the large cargo, scored two hits and got the "She's going down!" message about five minutes later. I assumed that because the hole was double the distance under the waterline - hence double the water pressure - the sinking "model" would flood the ship much faster. A small tanker similarly went up in about 15 mins with deeper hits. Ever since then I've been "aiming low" Maybe different ships have different hull shapes?

OK, so maybe one of my attacks was inside the 300m arming range then. That explians two out of three duff shots.

The reason I'm getting so close is that in the training missions there's one tramp steamer that sits still until you attack it, then it proves very adept at maneuvering out of the way. Of course I could aim in front of it but I'm guessing that it would then decide NOT to move, and simply let the eel pass in front. I've convinced myself that its probably best to attack the smaller faster unarmed ships from very close range using fast torpedos to rob them of the chance to get out of the way.

Oh, and I don't trust those new-fangled magnetic detonators