A magnitude 7.6 earthquake 1,500 miles away caused 4 ft high waves at Devil's Hole: https://www.cbsnews.com/news/mexico-earthquake-triggers-4-fo...
It may be that the aquifer in Devil's Hole is somehow connected to a network of underwater aquifers thousands of miles away in Mexico… but we just don't know, and have no way of knowing right now.
The safest class of substances I can think of are unusual isotopes.
They're chemically identical to the regular elements, which is what matters for life forms, but can be detected by scientific instruments.
> Earthquake-generated seiches can be observed thousands of miles away from the epicentre of a quake.
https://weather.com/news/video/how-mexicos-earthquake-caused... says the waves started about 20 minutes after the earthquake, which was 1,500 miles away. That's about 2 km/sec, which makes it (I think) due to the S-wave.
It's certainly not underground water being compressed for hundreds of miles before arriving at Devils Hole, if only because underground water flow doesn't work that way.
Seiches happen even in swimming pools, as at https://www.youtube.com/watch?v=-2JwUSD3x2s where the pool starts sloshing around from an earthquake about 200 miles away. They don't need to be connected to a larger water system.
I see from https://en.wikipedia.org/wiki/Devils_Hole :
> The pool has frequently experienced activity due to far away earthquakes in Japan, Indonesia, Mexico, and Chile, which have been likened to extremely small scale tsunamis
and https://home.nps.gov/deva/learn/news/alaska-quake-shakes-wat... notes the Alaska earthquake was 2,000 miles away in the other direction.
In reality though, our maps of the far side of the moon are as good as those on the near side.
> The hemisphere is sometimes called the "dark side of the Moon", where "dark" means "unknown" instead of "lacking sunlight"
[ed note: compare "dark ages"]
So the "unknown" (relatively anyway) side of the moon is less mapped, but not because it's unlit, but because it's dark. The lit side of the moon is well mapped, not because it's always lit - sometimes it's unlit, but it's certainly the known bit as we've been looking at it since before we were human.
Tbqh I think "dark side of the moon" is more often a genuine misconception than a poetic way of saying unknown. Fundamental misconceptions of the Moon abound, such as the mistaken belief that the Moon is opposite of the sun and rises when the Sun sets. You'd think that people would notice the Moon in the sky during the day for much of the month, but some people just don't pay attention to the sky, don't think about it much, and pick up the meme of the antisolar synchronous moon from cartoons, video games and grandfather clocks.
And sometimes people simply mispeak, perhaps due to Pink Floyd.
We still do not know a lot about our own planet. What makes us so confident we won't just screw up another planet with our lack of understanding...
Inigo: He's already dead.
Miracle Max: He is, huh? I'll take a look. Bring him in.
We screw up everything. The question is, can we leave places alone and screw up others instead? Screwing up the moon is probably better than screwing up Yosemite, or the Great Barrier Reef.
Patience is a virtue, as they say. I fear the current raft of would-be planet colonizers are not very patient...
https://nauticalcharts.noaa.gov/updates/how-accurate-are-nau...