I agree, the deeper you are the more time you have to avoid DCs; however, it's a double edged sword, sure you have more time to evade but those DC that detonate near you cause more damage.
DD's use pings to determine your depth and upon locating your depth adjust their DC's to detonate in approximation of that figure. I will say that it's more difficult for them to ping you the deeper you go.
I've found from personal experience in game that you needn't go very deep in relation to crush depth to avoid DCs. I rarely go below 100m in the years '39 - '42. From '43 and on I tend to hit the 170 meters deep. There are a few reasons for that: earlier in the war it's seldom you're DC'd by more than 1 or 2 ships at a time and it's much easier to avoid detection, plus the DD's are really relying on sound. Later in the war you need the depth to change courses as I've found 5+ ships will hunt you at one given moment.
My advice, have a couple Petty officers who are repairmen in the later years, they'll save you bacon.
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