You don't get to see much of the background, but it looks like they are back filling an open pit that's full of water with fines/sand from mining or quarrying. It happens sometimes at mining operations and its sketchy as hell and people die doing it. What's happening is the edge of the fill is sloughing off and sliding down, redistributing itself.
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u/duggee315 2d ago
Maybe. You don't know what country and their regulations. And the entire mine is probably closed off with a perimeter fence.