I got bombed with 75% hull damage at 160 ft. I am running TM 1.7.5 along with other mods. I think someone else posted that 200 ft. was a safe depth.
It sounds like a lot to avoid airplanes, but think of the size of the boat and also Pacific water is very clear in some areas in RL. Dive your boat to 200 ft. and then look at it under water from an external view level with the boat. The periscope masts aren't that far from the surface.
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