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
Those are percolation routes under the glacier. The size of the tunnel would vary a lot. Anyone going in and pulled by the current is not coming out for a 1000 years.
Look up “moulin” – death traps if you’re in the middle of a glacier.
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