Elementary, my dear KaleunMarco, I change defaults to keep the wild crocagators from eating people who ask me why I want to change defaults!
Q: Wait, there's no such thing as a crocagator!
A: See how good it works?
For the OP, the only thing in game affected by the test depth is the red needle on the deep depth gauge. That value is in the submarine's .cfg file, example;
\Data\Submarine\NSS_Porpoise\NSS_Porpoise.cfg
[Properties]
PeriscopeDepth=16.6;meters
SnorkelDepth=15;meters
CrashDepth=40;meters
MaxDepth=100;meters
;SurfaceDepth=4.2164;meters
SurfaceDepth=4.7;meters
TorpLaunchMaxDepth=30;meters
StormConditions=9,0.1;max wind speed [m/s], max rain intensity [0,1]
A meter is approximately 3.3 feet, so set for 100 meters and the red needle will be set at 330 feet. Those are text files, so can be easily edited in notepad. Don't forget to make a backup copy of the file in case your cat jumps on the keeeyYYYYybOard@&^%#$.
For the actual crush depth you'll need the editor;
https://www.subsim.com/radioroom/dow...o=file&id=4489
to open the sub's .zon file, in this example NSS_Porpoise.zon. Down at the bottom of that is "collisionable object", with the data CrashDepth (bad translation, they mean crush or maximum depth), also in meters.