Lot of dismissive reactions to these questions, but there actually are non sound related signals we use to detect submarines and there is absolutely research on how to do that from space. This article is great, but just read the "Signal Processing" section if you're interested in space. https://www.aspistrategist.org.au/prospects-for-game-changer...

Interesting article. Also, we are now able to reconstruct a conversation by analyzing the movement of the glass on a window to the room where people are talking. It doesn't seem absolutely out of reach that we could some day detect huge underwater vessels from analyzing surface perturbations.

> reconstruct a conversation by analyzing the movement of the glass on a window to the room where people are talking

May I please have a link to more information? I wasn't able to find anything, and this is very interesting.

"reconstruct conversation glass vibration" brings up a lot of relevant results from a 2014 story from MIT. Sounds like it works in principle with any medium that can have its visible vibrations monitored (bag of chips is the main example, but they talk about other options such as plants or a glass of water).

Yes I think that's what I was referring to; I may have confused glass and chips but it seems it works with either medium.

https://news.mit.edu/2014/algorithm-recovers-speech-from-vib...

They're operating at a -25% EBITDA, so no they are not.

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