With the fourth and last 10,000-tonne concrete element sunk, the U.K.’s new, 1.5-km-long River Tyne Tunnel crossed a major milestone late last month, but a missed dredging window, imposed to protect salmon migration, will cost a delay of two months.
Work now focuses on the final connections between the four 400-m-long concrete elements of the sunken tube tunnel (STT) near Newcastle. The first walk-through is planned for late this spring, says Paul Fenwick, project director at Tyne and Wear Integrated Transport Authority (TWITA).