In fact, the chance of being swallowed by the bottomless swamp is negligible. However, this type of sand actually exists in nature.
It forms when quicksand (or clay) becomes soaked in water and loses its structure. But you are unlikely to be drawn into them like in a cartoon. A 2005 study published in the journal Nature found that quicksand has a higher density than the human body. And people rarely sink below the waist into such sand.
The real danger lies where the swamp is. They are often found in tidal zones where rising waters can quickly engulf and drown people. And even in non-tidal areas, a stranded person can face hypothermia, dehydration and exhaustion if they don’t get help quickly.
Source: Ferra

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