Fun fact: You can never completely drown in quicksand,because quicksand is denser than human body.So one would only sink upto waist level before they start to float.
As for sinking deeper part, it happens because when you flail around in quicksand,you displaced mud from around yourself,creating empty space which makes it easier for a body to sink in. As learnt from discovery channel,to escape quicksand,you must free your arms outside then try to pull your body straight up using the arms.
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