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Channel Tunnel

After nearly 200 years of attempts and false starts, the Channel Tunnel is finished in 1994, at a final cost approaching £10bn. Despite the well publicised contractual wrangling between client Eurotunnel and contractor TML, the project was still in engineering terms a truly remarkable achievement. On the face of it, driving the two 50km long running tunnels and service tunnel through the impermeable chalk marl was relatively straightforward. But the reality was that difficult ground on both sides of the English Channel caused problems. This, management logistics and the successful excavation of the two enormous undersea crossover caverns, showed just how important the project was as a showcase for geotechnical engineering.

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