It looks like you can push the button without lifting the tiny computer.

I’m no astroseismologist but I feel like I’ve heard of sensors like this being on satellites like to investigate glaciers etc. though maybe 10km of rock isn’t so easily penetrated.

They did also say in the article that the rover could only measure straight down from its position, so maybe not all of the water is so deep.

Kris Harbour Natural Building - Guy building a homestead in rural Wales. He does some cool hydropower stuff. Built his own house and workshop. He’s currently building a timber framed barn of his own design for his equipment and the animals he raises using lumber he milled on a band saw mill that he also built (and I think also designed). This stuff is all documented on his channel. Dude seems really chill and down-to-earth.

Maybe gold or something