HS2 launches third London Northolt tunnel TBM

HS2’s London tunnels contractor Skanska Costain Strabag joint venture has launched the third tunnel boring machine to be used to dig part of the 8.4-mile Northolt Tunnel under the outskirts of the capital.
The tunnel will be constructed using a total of four TBM’s in two phases – known as ‘Northolt Tunnel West’ and ‘Northolt Tunnel East’.
Two TBMs, named Sushila and Caroline, are already constructing the longer 5-mile eastward Northolt Tun