The Channel Tunnel is a rail tunnel beneath the English Channel which links Great Britain and France. It is considered to be one of the most amazing engineering constructions in Europe. The second longest undersea tunnel in the world was opened in 1994. It is said that 13,000 workers and engineers participated in the construction project. The Channel Tunnel contains three tunnels. The south tunnel is for people who are travelling from France to the UK, the north tunnel takes passengers from the UK to France. Nowadays it takes 35 minutes to go from Paris to London in the Channel Tunnel. The third tunnel is a service tunnel. It is not used by passengers.