When drilling shorter distances, such as under a sidewalk, a dry auger kit is recommended ... out a larger machine escalates. With the right equipment, horizontal boring can be a breeze.

While breaking and repairing the surface is one approach to adding pipes, cables and lines below a driveway, sidewalk or other surface, that method comes with extra labor, cost and challenges.

PTI Drilling with the American auger machine resumed at the Silkyara tunnel overnight to prepare an escape passage for the 41 workers trapped inside for more than 10 days, officials said on Wednesday.