With everyone focused on Crossrail and the new super-sewer under London, another large scale tunnelling construction project has been taking place beneath your feet.
National Grid have dug 32km of new tunnel to lay high voltage power cables. We teamed up and went down with Tom Scott — who runs his own fantastic YouTube channel featuring Amazing Places, Things You Might Not Know and a plethora of other wonderful informative geeky videos. You can see them all at www.tomscott.com.
