Though I haven't read it here yet. I am patrolling in and around the eastern waters of of Scotland (U29 type VIIB) 100km SE of Scapa Flow when I hear the weirdest thing on the Hydrophones. It sounded like a drill from the dentist. Very high pitched and it oscillates...just like when you're getting your teeth drilled.
Am I to understand that SHIII (I am using GWX3) has biological sounds? Dolphins and whales, etc? They seemed to move fast. I was taking readings every 5 minutes and the source moved quite a bit. I'm thinking Flipper and friends...