Crossrail's last tunnel machine launches in east London
The last of Crossrail's tunnel boring machines, Ellie, has begun work on the section from near the Olympic Park to Stepney Green.
The machine, named after Paralympic champion Ellie Simmonds, is staffed by 20 people, 150 metres long and wieghs 1,000 tonnes.
Ellie, the eighth of Crossrail's tunnel boring machine will drill a hole 2.7km into one of Europe's largest mined caverns to help form the north east spur from Whitechapel to Shenfield in Essex.
Andrew Wolstenholme, Crossrail chief executive said: "Crossrail's continuing progress is evidence of Britain's ability to deliver large scale infrastructure projects on time and within budget.
"It is fitting that our latest tunnelling milestone, the launch of our eighth machine, Ellie, is taking place only a short distance from the scene of some of Britain's greatest modern sporting triumphs."
Crossrail recently passed the halfway point of its construction.