The fracturing fluid makes the fissures expand.
The electricity causes the shale to fracture.The natural gas flows to the surface and containers collect it.
They remove the fracturing fluid, and sand keeps the fissures open.
Machines inject fracturing fluid into the bore hole.
Energy companies drill holes around 1.5 miles deep.
Lorries transport the gas to market.Conductors send electrical currents into the Marcellus shale.