Originally Posted by GoldenRivet

strategic use of decoys...

What i have done in the past is launch decoys in the following manner.

While diving after the initial attack start a 270 degree turn, release a decoy every 45 degrees of heading change

lets assume you start at 000 degrees

here is the procedure

order a depth of 220 meters
start a right turn
rig for silent running
at heading 045 - launch decoy
at heading 090 - launch decoy
at heading 135 - launch decoy
at heading 180 - launch decoy
at heading 225 - launch decoy
at heading 270 - launch decoy - stop turn - continue dive to about 220 meters

this will create a descending spiral of decoys... the destroyers will be receiving seven echo returns when they ping... 6 decoys and 1 u-boat. this forces them to decide which return is the actual u-boat and then attack it... they have a 1 in 7 chance of selecting the right target... hopefully the selected a decoy instead of your boat.

sneak away at 220 meters depth making gentle 15 degree turns left and right.

never increasing speed never surfacing or never securing from silent running until you are sure you have escaped.

the problem with this strategy is you use up pretty much all of your decoys in the process, but you can refit at a supply ship.