Bosporus Tunnel Marmaray

Torsional rigidity tests for the first direct standard gauge link between Europe and Asia

The Marmaray rail tunnel is the first direct standard gauge link between Europe and Asia. It consists of an immersed tunnel under the Bosporus and is connected to the mainland via two shield tunnels. With torsional rigidity tests it was tested in advance which joint opening is tolerable for the segments lying 60 m below sea level.