Guys, thank you!
Basically, I'm not of the opinion that external mods must be avoided - beta version or not - but you have to look at where these mods change what! Propbeanie had the right nose.
I was afraid of the "single test", because I probably had this idea somewhere deep inside, but I really like the snorkel mod! Unfortunately
he is the bastard. I'll take a look at the three UPCUnitData's again. Maybe there is something else to save. Anyway, now this passive sonar is running again as it should.
And the "holes" should not be the problem. It's not like the boats are indestructible. I was also no time out of the window (äh sudden death, understand?), if I had deliberately or intentionally gone within the range of heavy ship or coastal artillery. Thank you again!