Engineering Marvel: How HS2 is using giant metal cans to overcome groundwater hurdles

Two massive metal cans are currently being assembled deep under west London to allow HS2’s tunnel boring machines to drill through water-saturated ground.HS2 is using four Tunnel Boring Machines (TBMs) to dig two train tunnels between West Ruislip and Old Oak Common. They set off from either end last year and will meet roughly in the middle of the tunnels at Greenford.
To remove the TBMs at Greenford, HS2’s contractors have dug two large shafts down to the tunnel depths to lift them