the only limited effect i ever saw from anyone (and i dont remember who) was an invisible torpedo which left a surface wake and moved at a speed of something like 100-140 knots... about 3 to 4 times faster than a normal torpedo.

basically, IIRC the torpedo was fired from an invisible turret on AI subs, the torpedo would fire at you and would travel so fast, perhaps as fast as a gun shell, that you could never or almost never evade it.

this mod was never released if i recall

:P I guess I set my standards too low..

Too bad, it would be fun to have wolf pack strikes.