How to Kill A Destroyer VERY easily

[hakkikt]

Originally Posted by Martin1813

this is a quite old tactic. (I've read somewhere that it was used by US sub agaisnt japanese DDs)

I find it difficult to believe that this should work in a RL environment
I do it like this (I guess most people do):
Starting from a situation where the escort has finally found you at periscope depth and comes running at you at full speed:
identify escort, set torp running depth 0.3-0.5 m below draft (there are drafts between 2.5 and 3.5 m), max torp speed, max sub speed, magnetic detonator, stern tube, fire at 500 m, crash dive.
Gets difficult as the war progresses, especially when they start using Hedgehogs.