Crews will bore 1.8 miles of twin tunnels and build three new stations in East Harlem under the $7.7B Second Avenue Subway Phase 2 expansion, supported by seven shafts and precast concrete liners.

In 1974, OKC Mayor Patience Latting described the city's underground Metro Concourse network as "the largest pedestrian tunnel system in the world." ...

Decades of empty promises are no more. The MTA board on Monday approved a contract to begin major construction on the Second Avenue Subway extension into East Harlem. The nearly $2 billion deal covers ...

A sinkhole on Samsen Road in central Bangkok exposed tunnels under construction for the Purple Line metro extension on Sept. 24, leaving a vehicle teetering at the edge. Officials said no injuries ...