New time-lapse footage has been released showing the progress being made below the capital on Crossrail.
More than five and a half miles of underground tunnels have now been dug.
These pictures show the work that is being carried out at the sites of Finsbury Circus and the new Liverpool Street Station.
The first Crossrail trains are due to run in 2018.
More top news
Sir Vince Cable has become the new leader of the Liberal Democrats, after no other nominations were put forward.
He is believed to be one of the oldest victims in a worrying spate of recent knife crimes.
The new leader of the council at the centre of the Grenfell Tower fire has told ITV News she will not resign 'yet' after a furious backlash.