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The tunnel boring machine drilling a new 5,700-ft-long tube for the Chesapeake Bay Bridge-Tunnel in Virginia has made major headway since its launch in late February—with the 3,000-ton, 308-ft-long Herrenknecht-built machine progressing 400 ft before halting for its first scheduled maintenance check in early May.
Located adjacent to the original 60-year-old, 17.6-mile bridge-tunnel system’s tube at Thimble Shoals Channel, about 3.5 miles offshore from Virginia Beach, the new tunnel is part of a $756-million project to eliminatie a longstanding bottleneck by connecting parallel above-water segments constructed in 1995 to carry southbound traffic.