Love the pics by the way, I should print them out and put them on the fridge.
The torpedoes need 400 meters to arm themselves, so what you are trying usually won't work. By the time you can see the ship, it's closer than 400 meters.
From what I gather from the pics, you got a destroyer bearing down on you and you want to do an underwater "down the throat" shot. You want to already be at 49 meters so you "hope" it can't get you or you get it first. But that's a very bad plan.
I use a down the throat shot a lot in my games. More than my crew feels comfortable with and have had several attempts of removing me from command because of it too.
I personally don't like to give up the surface. I dive to periscope and do all I can to stay there. Fighting off all who challenge my right to stay at periscope depth. It's like playing chicken. Don't Panic.
Every now and then I get a smart one that wants to serpentine his way in. Bastards they are. I have found "back emergency" with full rudder a more "lucky" escape plan though. Which is where I get the mutiny activities later.
