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WiseRevise t1_is2f8yn wrote

There is actually a depth that submarines can hide in because the salinity/temperature trap/reflect sonar. There’s a special name for it that Destin at SmarterEveryDay covered during a deep dive on a US nuclear sub. It’s an amazing series for anyone looking for something to watch.

Another fun fact from that same video is we actually developed rescue devices that would explode at that special depth, and microphones around the world could triangulate where a downed pilot was.

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Haphazard-Finesse t1_is2red4 wrote

The SOFAR channel. Another fun fact: Project Mogul was a top secret program to use high-altitude balloons equipped with microphones to listen for soviet nuclear testing, based on the assumption of similar sound channels existing in the upper atmosphere.

The Roswell UFO incident was likely spurred by one of these weird-ass-looking balloons with a bunch of specialized surveillance equipment crashing, and nobody having any idea what it was.

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