Subscribe to BBC News www.youtube.com/bbcnews For the first time, the BBC has been allowed to fly a remote controlled camera along the tunnels of Crossrail, the giant building project that will eventually see trains criss-crossing London and the South East on a brand new train line. Subscribe to BBC News HERE http://bit.ly/1rbfUog Check out our website: http://www.bbc.com/news Facebook: http://www.facebook.com/bbcworldnews Twitter: http://www.twitter.com/bbcworld Instagram: http://instagram.com/bbcnews