Entrance to HS2's Northolt Tunnel

HS2 tunnelling machines, Caroline and Sushila, at their launch site in West Ruislip, as they begin their 5-mile journey below ground towards London.

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Entrance to HS2's Northolt Tunnel: HS2 tunnelling machines, Caroline and Sushila, at their launch site in West Ruislip, as they begin their 5-mile journey below ground towards London.