I’ve seen a Youtube video of a man throwing a big rock in a glacier river at Matanuska glacier and the camera man asked “Is that an echo?”
I browsed the comment section and the comment theme tells me it is dangerous and death awaits when you dive.
In: Planetary Science
This video appears to be an opening into a sub-glacial “river”, possibly miles of which flows straight through the glacier with literally no air pockets or even light. You’ve seen how scary those videos of people trapped under lake ice can be. Imagine that except under twenty feet (or probably more) of ice and if it’s really a river, presumably it has a current as well. Absolutely terrifying.
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