David Cameron has marked the completion of tunnelling for Crossrail by hailing the £14.8 billion cross-London project as "an engineering triumph".
Clad in orange protective clothing and standing before a giant tunnel boring machine at Farringdon in London, the Prime Minister said Crossrail was "absolutely magnificent".
Addressing around 150 Crossrail workers deep under ground, Mr Cameron said the project made him "dead proud to be your Prime Minister".
Crossrail, running from Reading in Berkshire in the west to Shenfield in Essex in the east, is due to open in 2018 with full services running in 2019.
Boring machine Victoria's breakthrough at Farringdon meant all 26 miles of tunnelling through central London had been completed.
Accompanied by London Mayor Boris Johnson and Transport Secretary Patrick McLoughlin, Mr Cameron had walked through the tunnel at Farringdon to stand close to Victoria, which was one of eight boring machines used in the London work.