Subject: OT: Sounds from the Sea
Saw this referenced on another site I read regularly full of smart people. Thought the smart people here might like it as much as I did...

https://oceanexplorer.noaa.gov...

It's a collection of sounds from the declassified SOSUS sonar net used to track Soviet Nuclear Submarines during the Cold War. No cool submarine sounds. But there are a bunch of other sounds like earthquakes, marine life, and airguns (used in oil exploration). My favorites were the two "mysteries" at the bottom: Slow Down and Bloop.