Tunnelling has started on Transport for London's £1.2bn Northern Line extension to Battersea | City A.M.

Tunnelling has started on Transport for London's £1.2bn Northern Line extension to Battersea | City A.M.
... The first of two giant tunnel boring machines, named Helen, began her 3.2km journey to branch out the line from Kennington to Battersea. ... The two machines (the other's called Amy, FYI), were lowered 20m below ground in Battersea in February and now one has set off under south London to create the first of the underground tunnels extending the Charing Cross branch of the Northern Line from Kennington to Battersea Power station, via Nine Elms. ...