I am using a Sargo so have 4 rear tubes.
I use these when taking on an escorted convoy from 3,000 yards.
This gives me a big advantage as I am already facing away from the escorts.
I can go deep and slip away at 1 or 2 knots.
If you have BS and SR on and then take BS off that bloody whistle and the shouting order kind of defeats the SR objective.
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