The form system incorporates two halves that bolt together to create a 35-foot long by six-foot wide by 10-foot high tunnel allowing the construction of horizontal and vertical elements ...

Mexican officials discovered a sophisticated cross-border tunnel that began in a home in the town of Jacume less than a football field away from the U.S. border.

ST. LOUIS ( KTVI) — More than 30 feet below the ground in St. Louis’ Forest Park sits a system of tunnels. They’re part of ...

After decades of work, a massive tunnel system now runs 270 feet under the city's streets — all to keep rivers clean.