Kiewit has been a leader in the construction of underground facilities for more than 50 years. Our core staff of more than 200 full-time underground professionals has constructed some of the country's most challenging and impressive underground transportation, power, environmental and mine development projects. These involved drill/blast excavation; machine tunneling in hard rock and soft ground; NATM tunneling in soft ground and rock; deep shafts, chambers and caverns; and large open-cut structures.