If you move into the quicksand, this loose packing will collapse. We then have densely packed sand at the bottom, and water floating on top of it. It's the difficulty of getting water into this very densely packed sand that makes it difficult for you to pull your foot out.

Daniel Bonn

Bottom Collapse Loose Move Packed Packing Quicksand Sand

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Everybody thinks, thanks to Hollywood, that you can drown in quicksand. Basically if you do a simple buoyancy calculation, the Archimedes force, it is immediately evident that you can't drown completely.

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