My mother had a personal experience with quicksand. Unlike the movies, its name is correct. She was just suddenly stuck in it up to her knees.
So now you all know.
Also, it wasn’t in the jungle, it was in Canada, so she had to rely on being pulled out by my uncle since no vines were around.
Fun fact, the “Quick” part of it is an old timey synonym of “Living”. So basically, Living Sand. It’s the same thing with Quick Silver (mercury).