I've noticed that the boat is always few meters higher than the ordered depth. If I say dive to 15 meters, it goes only 13 m deep. I recently had a long patrol without any contacts and started to get paranoid if the hydrophones are working at all, but diving deeper seemed to help. Bug or not, but it keeps me on my toes.
So just to be sure, I also suggest you dive bit deeper than the basic periscope depth!
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