This is the submerged tactics I use, not necessarily correct, but based on hard gameplay experience.
1/ Warships don't attack until they detect or suspect you. They will use passive detectors only to listen while your undetected.
Tactics while undetected
Go into silent running. The further away warships are the faster you can go, (Needs experience). When close drop revs to 100 or 1 knot. (I have made a mod that does this at press of a button).
2/ Pinging, active detector. If you hear this then they have heard you.
There's 2 states. Pinging searching and detected, (Get to know the difference).
3/ If they are pinging searching. Then move away from that ship, distance and profile are important. Keep same tactics as undetected to avoid passive sensors. (I've had ships pass overhead without dropping depthcharges. This part is nerve racking and exciting).
4/ Pinging detected
If this happens then your cover is blown. Go into flank speed with partial turn away from that ship, (not full turn as this reduces your speed). You must continue this until you lose the detected pinging sound, most important as he will direct ships onto you. If ships come overhead make drastic course alteration and use tactics to avoid depthcharges, keep speed high to avoid them.
5/ Pinging searching
When you get this drop speed right down and go to silent running. You are back to state 3. Warships will spread out hunting for you. You'll get searching pings from all directions but keep cool and silent. Use sonar to tell nearest contact and then reduce profile.
P.S.
I have used these tactics successfully in the English Channel 30 metres max when surrounded by many warships making my sonar useless (too many contacts).
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