[cydonian_monk]

I can't find a link to the story at the moment (I'm on mobile), but I read recently they've started doing just that - doing image analyses on aerial/sat map data - to find cars and other things submerged in the Bayous here in Houston. Previously [1] they used more on-site resources, such as sonar, drones, and people in kayaks; etc.

1: https://www.houstonchronicle.com/local/gray-matters/article/...

[Nicholas_C]

I found a skateboard in a smaller bayou this past weekend in fairly good condition. I can’t imagine what else is down there. There is also a very surprising amount of fish in the bayous, including loads of plecos (aquarium sucker fish).

[Zhenya]

You might enjoy magnet fishing!

https://en.m.wikipedia.org/wiki/Magnet_fishing

[Nicholas_C]

Never heard of that! I can’t imagine how many weapons one would find at the bottom of the Houston bayous.

[outworlder]

also r/magnetfishing