In the early 1980s, Mott, Hay and Anderson provided design services to two of the consortia bidding for the Channel Tunnel (Euroroute, who proposed a road tunnel, and the Channel Tunnel Group). The bid by the Channel Tunnel Group and France Manche was successful: the two bidders joined forces and reformed as an operating company Eurotunnel and construction contractor TransManche Link. MHA were appointed as the contractor's designer for the works on the British site (designing temporary works, bored tunnel linings, cut-and-cover tunnels, earthworks, trackwork, terminals & sea defences) and as designer for the ventilation, aerodynamics, smoke control and refrigeration systems in the entire tunnel.