Work to create an extension to a rail route which will play a major part in the 2012 Olympics transport system has taken another step forward.
The extension should be finished by 2009
The Docklands Light Railway (DLR) is being extended from the existing King George V station to a new Woolwich Arsenal stop in south-east London.
A boring machine for the new 1.5-mile (2.4km) stretch has been put in place ready for tunnelling to start in April.
Olympic shooting events will be held at Woolwich's Royal Artillery Barracks.
It is expected to take 15 months to complete the tunnel from east to south-east London.
The line will run under the River Thames and enough material to fill 40 Olympic-sized swimming pools will be removed from the ground.
The extension should then be ready to open in 2009.
It is part of a £10bn five-year investment programme by Transport for London.
DLR director Jonathan Fox said: "I'm sure this new extension and the Woolwich Arsenal DLR station will be a tremendous asset for London and the local community."