As part of Transport for Londons 2012 Olympics expansion programme, a tunnel is being built under the River Thames linking Docklands Light Railway (DLR) King George V station to Woolwich town centre. A 540-tonne boring machine is working at a speed of two metres per hour and at depths of up to 35 metres under the river to dig the tunnel, which will take 15 months to complete. The new DLR Woolwich Arsenal station will be situated next to the mainline station. Measuring 2.5 km, the DLR extension should be opened in early 2009. When completed, it will connect Woolwich to London City Airport in five minutes.