Shallow water evasion

[treblesum81]

Wondering if its even possible?

I spent 6hrs (real time.... with TC it was more like 18hrs approx) trying to avoid a single black swan destroyer NE of Londonderry in <50m of water. I not able to get deep enough to allow maneuvering room to avoid DCs and much slower and less maneuverable than the DD I kept slipping by by the skin of my teeth until he got lined up just over me and I was sinking (they have two throwers on either side and i couldn't seem to slip by them that easily)... I managed to carry this on 3 times for hours but I could never lose the DD and in the end I died. I've since given up on attacking the convoy that DD was attached to as I just couldn't escape.

Is this sort of evasion even possible without huge amounts of luck? I can imagine this same issue would carry over to harbor raiding, as I've not seen one yet (I've only been in 3 including Wilhelmshaven) that is really deep enough for successful DD evasion. So is there a trick to conducting this kind of escape that will make you much harder to find and more likely that the DD will break off?

I'm using GWX 2.1 btw.

Thanks,
Greg