Mary is testing a new type of quicksand. This quicksand consists of weightless and absolutely dry black grains. These grains lightly stick to the skin and cover it, but are also easily removed. The girl's body easily sinks lower with every movement. Mary, without much effort, completely immerses herself in this quicksand. After complete immersion, she emerges from the hole.
Note: This is a fantasy scene intended to entertain fans of women in peril. Nobody was harmed during the filming of this scene.