Salini Impregilo operated Tunnel Boring Machine called 'Christ' breaks through the shaft at W Street in Northeast Boundary Tunnel (NEBT).

Launched in 2018, 23 foot (7 meters) TBM Christ excavated through clay and sand. It will get maintenance at the shaft before boring the last part of 5 mile tunnel. Project site writes Chris the machine is on a five-mile-long underground journey digging the NEBT which is the last tunnel segment of the Anacostia River Tunnel. This is actually a giant 23-foot-diameter sewage tunnel that can store 90-million gallons of combined sewage during heavy rains to keep from overflowing the combined sewer system in the District. The combined sewage will ultimately make its way to the Blue Plains Advanced Wastewater Treatment Plant where it will be treated, cleaned and recycled back to the Potomac River.

This is when it was lowered to a shaft to start boring

Time flies. Congratulations to Salini Impregilo.