[razark]

I'm not aware of any videos.

If they don't know where you are-
Head away from where they are dropping. Stay as deep as you can, and silent running. keep your tail to them, it presents a smaller target.

If they know where you are-
Wait until you hear them dropping. Ahead flank, change depth, and turn left or right, but don't put the rudder all the way. The charges are set to a depth before they drop, so don't be at that depth when they get there. Before the charges finish exploding, cut the engines back to silent running and coast. Don't let them chase you in a circle. Keep heading in a general direction, and keep going until you lose them. Time is good. Stay deep, and the charges will take longer to reach you, so you can run further the deeper you are. If you put the rudder on hard left or right, it will slow you down, so make gradual changes, and try to keep it straight while you coast.

Edit:
And if you start taking heavy damage, you can always ahead flank, emergency surface, and try to fight it out on the surface.