Dirty Great Machines S01E04 - Beasts of Destruction

Meet the machines that are making mincemeat of the hardest rocks on the planet. Almost two miles underground in the Kidd mine in Canada, the mighty ITH drill is chewing through rock, to enable the extraction of copper and zinc. In Finland, the Jumbo Tunneller is boring through granite to excavate a new metro tunnel to improve Helsinki's commuter services.