The £1.2bn Northern Line extension just reached a major milestone: It has finished tunnelling work from Battersea to Kennington | City A.M.

The £1.2bn Northern Line extension just reached a major milestone: It has finished tunnelling work from Battersea to Kennington | City A.M.
... A huge tunnel boring machine broke through this morning at Kennington, meaning two 3.2km tunnels from Battersea Power Station, via Nine Elms, have now been built. ...