Sink into Earth

The druid casting this spell can choose to sink himself or one nonliving object into the earth for a distance of up to 5 feet per level, measured from the point at which the object rests on the earth. The object or druid so sunk can come back to the surface at will or automatically so when one day per level of the druid has passed. While sunk, the druid or object is completely safe from burrowing creatures or movements in the earth. In addition, the druid enters a state of hibernation, requiring no food or water for the duration of the spell. If a cave or other opening lies beneath the object when this spell is cast, the object drops through the roof of the cave and lands on the floor, taking no damage, whereupon the spell continues where it left off.

The material components are a miniature shovel and a bit of earth.