We were commissioned by Eurotunnel to build three key turnkey tunnels with a total length of 150 kilometres. The tunnels, which run for 10 kilometres underground and 54 kilometres beneath the sea, include: 2 single-track rail tunnels and 1 service tunnel. Drilled to a depth of 25 to 45 metres below the seabed of the English Channel in a rocky layer of “blue chalk”, this underground rail link connects France to England.