Depth Charges: Strategies to escape

[DigitalAura]

In one of my other threads, STEAMWAKE had referenced the hedgehog weapon in a discussion about depth charges and ASW.

the link http://en.wikipedia.org/wiki/Hedgehog_(weapon)

I noticed this :

"When a depth charge explodes it can take 15 minutes before the disturbance can settle down enough that sonar becomes effective"

Does this play out the same in SH4? I wasn't aware that charges rendered PASSIVE SONAR useless for a spell. Do you guys hit the gas when you hear charges? What are your strategies in escaping from them? Should you stay silent? Does it depend on how close they are to your whereabouts? [beg pardon, I know there are probably umpteen topics related, but I didn't get far tyring to answer this question specifically about slipping away during depth charging]