Rising Costs and Delays in Seattle Area Wastewater Plant and Tunnels

The tunnel liner that is being placed by the Bertha tunnel boring machine consists of precast concrete segments. This video by the WSDOT shows how they are made at the casting yard, and what Bertha […]

Finland is leading the world when it comes to permanently disposing of spent nuclear fuel in a deep geologic repository. Their Onkalo facility recently completed excavation of the first of five final disposal tunnels, a […]

This is an interesting video of crews changing cutterhead teeth on the Bertha TBM beneath downtown Seattle. [Source: WSDOT YouTube Channel. Image: YouTube]