Go to the sonar/radio room (F9) and then right-click on the soundman. Same thing if you want to jump into the radio operator's seat.

OR, Press "H" for Hydrophone.
OR, Right Klik on the sonar operators icon.

With this topic, I prove that I know nothing about hydrophones:oops::oops::oops:
I will think about a return to the academy on sound trainer.
I just hope that war will not come to end when I'll take command of the U-boot again...:know::know::know::timeout::timeout::har:: har:

You will do fine once you get the hang of it.:DL
Trust me-the war never ends-only your career.:yep:

Yes, as they say in the intro in "Fallout 3", WAR NEVER ENDS