Case Study on Retrofitting

Retrofitting Seattle's Mount Baker Ridge and Mercer Island Tunnels using a Saccardo Nozzle.

Ventilation and Safety Systems Design for SR99 Single Bore Tunnel

Innovative design of Seattle’s SR 99 tunnel facilities - including ventilation - required close coordination of static and dynamic safety systems for both emergency and normal operating conditions.

Top 5 Factors to Consider When Purchasing Ventilation Fans

Designing and procuring a ventilation system can be a daunting task. Everyone has their own ideas of how a ventilation system should look. But, as the saying goes, “there is more than one way to skin a cat.”

2017 Tunneling Industry Outlook

Each year, TBM publishes a tunneling industry outlook by polling a sampling of tunneling professionals. Most agree that demand is high for tunneling.


Published three times per year, Tunnel Updates recaps ongoing tunneling and underground construction projects in the United States and Canada.

Contractor Prequalification Can Be an Effective Risk Management Tool – If Properly Applied

When a contractor has been prequalified for a project, it increases the chances of success on many fronts, making it an effective risk management tool.

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