Crossrail’s train tunnels are three quarters complete following the breakthrough of the Victoria TBM into Whitechapel station.
The 150m long machine broke into the huge underground space at Whitechapel where work is taking place 35 metres below the surface to create over a kilometre of new platform and passenger tunnels for the new Crossrail station.
 
Read more at:
http://www.constructionenquirer.com/2014/04/06/crossrail-tunnelling-marathon-shifts-to-final-stages/