Transport for London has announced completion of tunnelling work on the Northern Line Extension project.
The breakthrough of the second tunnel boring machine (TBM) – named Amy - marks the completion of the twin 3.2km tunnels between Battersea and Kennington.
Amy and her sister Helen were launched in spring this year and have worked around the clock to bore the tunnels that will extend the Charing Cross Branch of the Northern Line to Battersea.
The extension is due to open in 2020 and is the first major extension of the Tube network since the Jubilee Line was completed in the late 1990s.
According to TfL, the link will add vital capacity and enable regeneration of the Battersea, Nine Elms and Vauxhall areas of London.
Mayor of London Sadiq Khan said: “This breakthrough is a momentous moment for a project that is going to bring huge benefits to south London. The Northern Line Extension is not only going to make travelling to Battersea and Nine Elms easier, it’s also going to bring tens of thousands of new jobs and homes to the area. It’s another great example of why new infrastructure is so vital to London’s success and the wider economy.”
The cutter head of both machines will now be lifted by crane out of the shafts at Kennington while the rest of the machines will travel back to Battersea and be lifted, in parts, out of the ground there.
While the tunnelling work has progressed well, discussion around who will pay for £240M of changes to the station box design at Battersea following changes to the over site development are still underway.
Transport for London director of major projects Stuart Harvey said in October that the full costs will not be known until December and did not rule out taking the Battersea Power Station developer to court to recover the costs.