Who We Are

Who We Are

We are a worldwide leader in tunnel design and engineering and our firm can look at a history of over 170 miles of successfully completed international tunneling projects.

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East Side Access

East Side Access

East Side Access is one of the most complex, ongoing metropolitan transportation projects in the US, located in the heart of Manhattan, New York. For the past decade, GZ has been involved in this endeavor rendering design and construction management services.

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Devil’s Slide Tunnel

Devil’s Slide Tunnel

GZ provided Integrated On-Site Team (IOST) support services for engineering and construction of two tunnels bypassing a stretch of California highway US 1 that is notorious for landslides.

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Crossrail

Crossrail

GZ provided expertise in design preparation incorporating sprayed concrete linings (SCL) for this project’s five London underground stations: Liverpool Street, Whitechapel, Bond Street, Tottenham Court Road and Farringdon.

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Featured Project

Caldecott Tunnel Fourth Bore Project

Caldecott Tunnel Fourth Bore Project

Contra Costa Transportation Authority / CALTRANS Caldecott Tunnel Improvement Construction Management Services: The existing Caldecott Tunnel consists of three two-lane … Read more »

Most Recent

See All News American Experience – Inside the Tunnels

American Experience – Inside the Tunnels

An upcoming episode of “American Experience” airing on PBS will detail the MTA’s East Side Access project.  When completed, the … Read more »

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