Burrow Trick

You touch the ground and an underground area of extradimensional space becomes accessible through an invisible entrance at the point you touched. 

The extradimensional underground space can be reached by crawling through the invisible entrance. The space can hold as many as eight Medium or smaller creatures. The entrance will be visible only from inside the space. 

Attacks and spells can't cross through the entrance into or out of the underground space, but those inside can see out of it as if through a 3-foot-by-5- foot window centered on the entrance.

Anything inside the underground space is expelled when the spell ends.