There's Something Unique About The New Northern Line Tunnels | Londonist

There's Something Unique About The New Northern Line Tunnels | Londonist
... The Northern line extension is still part of the Northern line, continuing its route beyond Kennington on a new branch.  ... Tunnelling took place between April and November 2017, on two 3.2km tunnels between Battersea and Kennington via Nine Elms. ...