Robbins Double Shield TBM Completes Critical Wastewater Tunnel A Robbins Double Shield TBM achieved a timely finish at the Black River Wastewater Tunnel in Lorain, Ohio, where it broke through on April 29, 2014. The 1.7 km (1.0 mi) EPA-mandated tunnel will prevent heavy rains from triggering sewage overflows into the Black River, which empties … Continue reading Onsite Assembly Makes for On-Time Breakthrough in Ohio