A long wall mining machine uses a chain and slat conveyor to transfer coal on to the conveyor belt for transfer to the surface. The chains have links made from very high tensile steel (32mm diameter) and to cut a link with a hand hacksaw can take up to 2 hours. 

Underground where there is no electricity available, no compressed air, and no sparks can be tolerated, hydraulic power is key.  The MP18 Chain Cutter is a slow turning saw, powered by hydraulics, which forces the cut in approximately three minutes without heat or sparks.