Trust me, the values for the AI detection are in the sim.cfg
I mean that issue that in GWX AI's hydrophones can hear you regardless of what you do to be silent. I noticed this on my first patrol and tested it in DC pursuits once in shallow water and another time at a depth of 70 - 100 meters.
I'm now trying to understand why the "use crew efficency" on the hydrophones was removed, GWX dev's are experts, and so I think there must be a reason for this.