Who can find this file and revising it .

[W_clear]

Hydrophones do not work at periscope depth(55ft).

But when submarine dives depth to 56 feet,Hydrophones Begin to work .Who can find this file and revising it .

[U-Bones]

Hydrophones do not work at periscope depth(55ft).

But when submarine dives depth to 56 feet,Hydrophones Begin to work .Who can find this file and revising it .
See this thread
http://www.subsim.com/radioroom/showthread.php?t=112341&highlight=hydrophone

If you don't want to tweak your own, you can use the sensors from the
Flavord To Taste modpack by Ducimus.