Dirty Great Machines - Season 1 Episode 4 Hard Rock Heroes
In Canada, almost two miles underground in the world's deepest copper and zinc mine, a mighty drill chews through rock, digging deep holes which are then filled with explosives and detonated, leaving behind debris packed with valuable minerals. Meanwhile in Helsinki, Finland, cameras follow a mission to excavate a new metro tunnel to improve commuter services - but working seven metres beneath the bustling city calls for precision engineering and one false move could lead to disaster. Plus, a mining machine works continuously underneath the Cheshire countryside to keep Britain's transport network moving. Last in the series.
First Air Date: Apr 27, 2012
Last Air date: May 18, 2012
Season: 1 Season
Episode: 4 Episode
Runtime: 26 minutes
IMDb: 0.00/10 by 0.00 users
Popularity: 0.1423
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