[Philipp_Thomsen]

Depends on a lot of factors. The ships bounce up and down on the waves.

You can miss a shot even if you set the correct depth, cos if the ship is too high on the bounce, the magned don't detonate. If it's too low, it bounces off the keel.

I normally set the detonator to 0,8 meters below the keel, as indicated in the book.

I think the maximum distance for detonation under the keel in game would be something around 3 meters.