The America's Huge Dig - Mega Structure.

Digging is the process of using some implement such as claws, hands, or tools, to remove material from a solid surface, usually soil or sand on the surface of the Earth. Digging is actually the combination of two processes, the first being the breaking or cutting of the surface, and the second being the removal and relocation of the material found there. In a simple digging situation, this may be accomplished in a single motion, with the digging implement being used to break the surface and immediately fling the material away from the hole or other structure being dug.

Read More: https://en.wikipedia.org/wiki/Digging