This method can work against early war ('39-'41) escorts. I doubt that it's effective against mid or late war ASW vessels.
1) Attack them in rough seas & preferably at dawn or dusk and in deeper waters (150 meters or more).
2) Try to maintain a depth of 13-14 meters and keep your speed down (go as slow as is possible)
3) Approach them diagonally & wait until you see their speed drop 13-14 (or less) and try to get as close as you can, 1000 meters or less.
4) Check your nav map (F5) frequently to ensure that you're not presenting a large target for them to detect.
5) Select 2 T1's and set the depth on each to minimum (2 meters), impact fuse & maximum speed. The second one is a backup in case the first fails.
6) Be ready to crash dive immediately.
I've been fortunate enough to destroy several Black Swans, J&K classes & a couple of Flower class corvettes. However under most circumstances I think that you're better off leaving escorts alone. Generally speaking, the pay off (renown) really isn't worth the risk.
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