U-292 had a successful maiden patrol, 32k out in BD grid, grinding tonnage for The Black Pit. No trouble encountered so I did no deep dives. Found some info showing depth charge specs
http://www.navweaps.com/Weapons/WAMUS_ASW.php
So it comes down to how it is programmed in the game. If there is no max DC depth then no number is safe. If there is, the VIIC/41 should be able to sail below this floor essentially immune.
Anyway, aircraft are always the most dangerous enemy. In SH3 I played more than one hundred dead is dead careers and managed to reach the end of the war exactly one time! Many of those were depth charges, but more were aircraft.
One thing that potentially works in our favor is how the tech upgrades are handled in this game. The player can get way ahead of historical timeline. Obviously I got the VIIC/41 more than a year early. I had the Cross in early 1940, before the enemy even had radar. Now in summer of 1942 we have FAT, T5s, Borkum detector, GHG Balkon and more. All of this makes it easier than it could be, with a more strict adherence to historical service dates. I will use some house rules in subsequent careers to temper our successes, but for this first one I am not holding back so I can assess what needs to be done in later careers to get it where I want it to be.
The Cross was a passenger for more than a year, and we did not start picking up signals until November of 1941. It's odd, but the detector is installed on the boat as part of the radio room, but it is the soundman who needs to be on duty to use it. Since I've opted for three engineers, that leaves gaps in my Cross coverage (two radiomen, who need to run both sound and radio rooms, plus rest so cannot have continuous coverage with my current officer distribution). It nearly cost us last night. During this down time, at night west of Ireland in the BE grid we got jumped by an aircraft and it was close. I've invested all of our specialization points so far in to dive time and silent running, so we were able to get under and avoid the charges or bombs that were dropped. But one of these days we will run out of luck. Clearly this aircraft had radar. I believe it was a Halifax.
One thing I am doing in this career is making my refits as long as possible. I want to slow down the operational pace, and can get it to about four weeks in port using vacations and intentional indecision with the quartermaster. Even so, we have done 26 patrols/missions by June of '42. Our tonnage mark is nuts too, so some house rules to tone it all down will be in order. The pace slows as we get later in the war, with more distant patrol or mission areas, and more time spent at sea.
Being ahead of the tech curve gives us an edge, so there's a chance to see out the war I reckon. Hard battles await.