Thanks for the responses guys. Let me clarify a few things...
1) I only shot 2 torps at the 1st destroyer in my first attempt at him. As the 2nd torp left the tube was when the 2nd destroyer came out from behind the first and I knew I was in trouble. The other 6 were fired to try and get them off my tail. I've had occasions in other non-TMO games (just installed TMO) that when I shot at targets they pinged at me but just kept going. Was hoping this would happen this time, but it didn't.
2) Certainly learning my lesson about facing off against destroyers in shallow water. Wasn't my original intention but I'm pretty sure he spotted me at about the same time I spotted him as he was already inbound at full speed on my first contact with him.
3) The impression I have about pinging came from a tutorial or video off this site (don't remember which one) and Razark wrote it almost word for word. If they're pinging they're not listening but they can switch very fast and if there are multiple boats one is usually pinging while the others listen.
4) The bad news is that it's calm seas with no wind. The good news is that this whole engagement started just after sunset so I have all night to try to get away. I expect once the sun comes up they'll call in air cover and I'll be cooked.
I'll give it my best shot and see what happens. The joy of learning how to be a smart sub captain.
