Back in 1994 i was hiking Cumberland Island national seashore. Most of the hike was along the beach during march, and the weather was quite pleasant. My group became a bit scattered as we hiked, all just enjoying the serenity of the ocean. As I was walking a kept hearing a strange sound. A loud sound coming from the sea.
The best way I could describe it is the sound the tub makes when you pull the plug from the drain to let the water out. A loud “GLUG” sort of sound…but with a pronounced echo. Maybe yet another, more amusing way to describe the noise (and I’m dating myself here) is the sound Sonic The Hedgehog makes in the underwater levels when he runs out of air. The pitch was actually fairly close to that.
At the time, I thought it was pockets of gas escaping from under the sea bed or whales or something, though it seemed awfully loud for either of those things. It was creepy. I know about the see “bloop” that has been recorded by underwater microphones(https://en.wikipedia.org/wiki/Bloop), but this was clearly audible from land. This has been bothering me for years. Any ideas as to the source of the sound?