The experts say it will take at least four years to build a train tunnel, Mayor Dean Trantalis says. But the county wants it ...

"Tunnel Girl" in Herndon, Virginia, "finally" got her tunnel project approved after pausing the project due to a potential violation. Locals and social media users react.

The Fehmarn Belt Link is set to connect Germany and Denmark through the Baltic Sea by car and train. Developers say the ...

The U.S. House of Representatives passed a bipartisan bill from Rep. Eli Crane that would require national defense agencies to share with Congress more information about illegal cross-border tunnels.

A group of divers has found 100 metres of underground tunnel extending from Pines Cave, near Tantanoola. The tunnel comes within 15m of another cave, with hopes a path between the two can be found.

Researchers have discovered hidden tunnels beneath Milan’s Sforza Castle, which may have been used for military defense, possibly connected to Leonardo da Vinci’s designs. The underground ...

Crane, R-Ariz., and Rep. Lou Correa, D-Calif., introduced the Subterranean Border Defense Act to require an annual report on the federal government's knowledge of illegal underground border-crossing ...

The Delhi Metro Rail Corporation (DMRC) completed an underground tunnel at Vasant Kunj station on the Tughlakabad-Aerocity corridor, marking a key milestone in its Phase 4 expansion. This 26km ...

New Delhi — Rescuers in India were still racing Wednesday to save eight workers four days after they were trapped underground by a collapse in a tunnel under construction in the southern state ...