Not 100% sure but with "wet sand" the author probably doesn't mean beach sand which just got moist from the sea, but rather so-called "quicksand" (https://en.wi

Not 100% sure but with "wet sand" the author probably doesn't mean beach sand which just got moist from the sea, but rather so-called "quicksand" (https://en.wikipedia.org/wiki/Quicksand https://en.wikipedia.org/wiki/Quicksand)