Any reason to launch passive CM in sub ?
 

Have you ever been targeted by passive homing torpedo from AI ship ? Does it have any sense to drop both active and passive CMs ? I mean .. passive CM makes a lot of noise, giving your position just to everybody (who does not know yet). It also masks torpedoes so it is harder for you to track them. And what more, you can load some active CMs instead of passive ones.

I don't think AI fires passive torps, but humans sure do! If you're playing with LW/Ami though, passive torps have a very hard time acquiring subs are are practically useless against them.

On the other hand, once Amizaur's torp control mod is finished, passive decoys may become a lot more important, since the player will be able to switch the torp from active to passive homing at will!

Edit: Here's a tip. Mark the incoming in BB and check the speed in DEMON. If it's 50-55 knots, it's active. If it's turned down to 45 or lower, it's probably passive, so get the right decoy ready! (TEST-71 exempted)

I got hit by a passive torpedo fired from a TYPHOON SSBN the other day. It never pinged once. I suspect it had to do with the sub being set to "avoid" hence it tried to remain more stealthy.