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Cuadrilla shale gas drilling rig drills a hole before the service rig prepars for 'fracking' at Singleton, Blackpool, Lancashire. Shale gas is a form of natural gas that is trapped in tiny cracks of rocks buried thousands of feet beneath the surface of the earth..A small company called Cuadrilla Resources became the first in Europe to start drilling for the gas, which has already revolutionised the energy market in America.