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
[Throwing a rock into a glacier river!
Matanuska Glacier ](https://youtube.com/shorts/_lTKHsBwAyE?si=aqTK2wPjJCD0lXWW)
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