As for destroyer and depth charge evasion, here are some tips.
1. Always try to go as deep as you can, the deeper you are the longer it takes the ash cans to reach your depth, the more chance you have to evade them. Also depth helps with evading detection some.
2. generaly use silent running at 3 knots (3-5 if your in the XXI). When the Destroyer makes his run (you will hear the engines over head and the pinging will have stoped) go to ahead flank, turn off silent running (so you can repair during the run) and turn hard into the direction of the DD, once the ash cans stop detonating, go back to silent running at 3 knots. Driving away from the DDs.
3. In very shallow water (50m or less) you may want to consider fighting them off, as you have little other choice, a bunch of wasted torpedos is far better to a destroyed boat. Personaly i try to avoid shallow water engagements with destroyers around.
4. Alternating depth can help throw off the DD's run. Generaly best done when at flank speed as you change depth alot quicker. If your realy deep you can also blow ballast (emergency surface) and set your depth at least 50-100m below the surface (blowing balast will make you climb at least 50m), just be sure not to run out of compressed air, and not to pop onto the surface.
5. Try to conserve battery power, only use flank when you have to. Its not unknown to have to spend many hours avoiding depth charges before they finaly give up.
6. Try to position yourself so the dd(s) cant make a run on you from the stern of your boat. Idealy try to keep them at your 90/270 degree line (left side or right side), or if you can try going head on (this tends to mess up their run as they will usualy drop too late). 90/270 is best though as you will tend to avoid most to all of the pattern.
7. When the enemy is pinging looking for you, your best off either pointing your bow or stern at them to lower your sonar profile.
&. When the DD's loose contact with you they will start droping depth charges randomly, this is the time to try to escape by driving directly away from them with silent running at depth. Try to keep your sonar profile as small as possible by keeping your stern pointed at them (see 7.)
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