[CapnScurvy]

For those that are encountering the sound that's being heard when nearing Truk Island area, check your Hull Damage reading before and after the sound occurs.

I took a trip to see for myself Beginning Year, 1943. I didn't notice anything out of the ordinary until I was within the atoll area (the light colored ocean surrounding the Truk Island group). At Radar Depth (subs keel about 40 ft deep) the depth under my keel was around 24-27 ft....that's about 65 ft deep in most places, sometimes more, sometimes less. Seas were moderate to mild. I noticed when I heard the "sound", I checked my Damage Management screen and noticed a higher amount of Hull Damage had occurred from the digital readout. I'm suspecting the sound is coming from damage that's occurring to the sub due to the shallow water in the Truk area.

One way to find out is to run your sub aground to see if it sounds the same. I didn't get to check this because I was soon killed when I surfaced at night and the gun battery on one of the islands somehow spotted me and sunk me before I could do anything about it. Going to be getting around to those eagle eyed land lubbers soon!