Houston's downtown tunnels are a six-mile, air-conditioned network linking offices, shops and hotels that form a hidden world ...

Nashville workers walk off Boring Company tunnel project citing safety concerns and unpaid bills as construction enters ...

HARRIS COUNTY, Texas -- Findings from an ongoing Harris County Flood Control District feasibility study estimate a $30 billion price tag for a potential countywide stormwater conveyance tunnel system.

The Israel Defense Forces (IDF) have uncovered what they describe as one of the biggest and most advanced Hamas tunnel ...

The Israeli military blew up a tunnel underneath a cemetery in Gaza after discovering that Hamas terrorists were using the tunnel for its activities, the Israel Defense Forces (IDF) said Monday.

(MIRROR INDY) — Citizen Energy Group’s DigIndy Tunnel System has been under construction for more than a decade and is finally nearing completion. But many still have questions about the $2 billion ...

Downtown Oklahoma City was headed underground in 1973. The million dollar network of tunnels that would link more than a dozen buildings and connect with existing tunnels would be quite the ...

SEPTA is extending its trolley tunnel closure through at least Nov. 30, hoping to use the extra time over the Thanksgiving ...

The Center City trolley tunnel remains shut for repairs to the overhead power system. Get unlimited access to Inquirer.com ...