The second element for the Fehmarnbelt Tunnel has been installed on the seabed. Operations commenced on Tuesday evening, 23 June 2026, when the 73 500-tonne concrete element was towed out into the Fehmarnbelt. Five tugboats transported the element to the tunnel trench, where it was manoeuvred into position with pinpoint accuracy using steel wires. Immersion began during the night into Friday.

Tunnel and underground construction would not be possible without construction machinery. In confined spaces, these often highly specialized machines must carry out a closely coordinated sequence of...

On 16 and 17 September 2026, the 4th International Workshop on Injection Technology for Tunnelling will take place at the Hagerbach Test Gallery in Switzerland. The programme covers the planning, implementation and quality control of chemical injections during tunnel construction. As the number of participants is limited, please register as soon as possible.

Science meets mechanical engineering, theory meets practice, and academia meets industry. And Zurich meets Schwanau. Georgios Anagnostou and Martin Herrenknecht have a good reason to meet: A joint study by ETH Zurich and Herrenknecht AG on the feasibility of a tunnel under the Strait of Gibraltar has been finalised and concludes that this long-cherished dream is now technically feasible. A conversation among experts.

The Holzminde is a small river that flows through the center of the town of Holzminden in southern Lower Saxony, Germany. The town’s proximity to the “red water”, as the Holzminde is popularly referred to, has shaped its development over the centuries – and in 1904, one section of the river was diverted into a tunnel structure. This made it possible to create enough space for new traffic routes in the town center. The result was the construction of what is now the state highway L550. More than a century later, the historic tunnel is once again the focus of an important infrastructure project: over the years, time had left its mark.