Tunnel machine Elizabeth, named after the Queen, broke into the eastern end of Liverpool Street Crossrail station yesterday morning.
The breakthrough occurred 40m beneath the City of London. The tunnel machine has just 750m more of tunnel to bore, before arriving at its final destination at Farringdon station.
Andrew Wolstenholme, Crossrail chief executive said: “We are now on the final countdown to the big breakthrough at Farringdon, which will link all of Crossrail’s tunnels for the first time. This is a phenomenal feat of civil engineering.”