It is here that the Lark flies above the Sinking Desert. It is here that the eroding empty cells of ruins, unknown to any civilization in recorded history, remain stacked about an entire mile bellow the surface. As each cell collapses, the ones above it sink, leaving a void that is filled by sand. About twenty cells collapse in one hour, creating constant, powerful "rivers" of sand to stir the desert into a dangerous frenzy.
But it is here that the sand worms lie suspended in the desert. When the Lark arrives, she sings loudly. Somehow, the sand worms can sense her sound waves, even through the chaos of the sand above. They begin to rise and roar with the Lark's singing. She flies in arcs high above the desert for a few hours, before she parts ways with the worms. When she leaves, they subside back into the sinking desert, not to be disturbed until the next passing of a Lark.