Video: Changing cutting tools on Bertha TBM

The British Tunnelling Society (BTS) is encouraging our profession and the public to celebrate National Tunneling Day today, December 7.  Their goal is to promote the industry (and its many professions) to students of all ages […]

The massive 13-mile wastewater tunnel project known as Brightwater is approaching the final stretch of tunneling, but perhaps the most difficult. This portion of the project has already claimed one contractor’s slurry TBM and put […]

The Bertha tunnel boring machine has resumed chewing away beneath Seattle after a ‘suspension for cause’ order from WSDOT shut it down in January following two safety incidents. The BTM began tunneling with some conditions […]