Quicksand consists of several components. One of them is sand, the second is moisture or air (or hot steam). In this case, it is important that the water or gas flow rises and that the sand has a smooth fine-grained structure.
The thing is, the sand eventually turns into a stationary Newtonian fluid. And in any impact on this sand, its viscosity will decrease and it will become fluid like a liquid. And the object lying on its surface at that time will sink inward.
It is unlikely to drown instantly in the swamp. However, this type of sand is dangerous because it will absorb it even more strongly when the person tries to free himself. Getting out of the sand on your own is nearly impossible.
As a result, a person or animal that falls into the swamp will be most vulnerable to tides or sunstroke.
Source: Ferra

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