Though underground sites are punishing environments, we feel quite comfortable there. As a leader in underground construction, we’re known for our broad and comprehensive capabilities. We drill vertically, horizontally and at all angles between — in sizes ranging from microscopic holes to roadway tunnels of up to 58 feet in diameter.
We build tunnels for highways, railroads, subways and rapid transit systems. We construct tunnels, shafts and other facilities for water supply and wastewater transport. We develop and equip underground mines for coal, salt, copper, gold and other minerals. We design and install innovative hoisting, elevator and vertical conveyance systems. And we do it all with the steady approach, exceptional quality and flawless focus on safety that working under the surface demands.