Tunnelling started in March 2010 and four TBMs have been used to build 6.2km of tunnel beneath the city centre. In August this year it was revealed that the last tunnel section of the north-south line that forms the connection between Amsterdam Central Station and the bored tunnels was in place.
The EUR 3.1bn (USD 4M), 9.7km line will have eight stations and is due to open in 2017.
