This video, made by Chesapeake Energy, is the second of a two-part video series that explains the science behind its method of hydraulic fracturing to extract underground natural gas that is captured in shale rock.

The visuals show high-pressured water cracking open the rock and allowing for natural gas to come up to the surface through the company’s well. The first video focuses instead on the actual process of drilling the initial well.

Although the process has been the source of much debate, some proponents of natural gas say it is a rich domestic supply of energy.

“I think fracking is a tremendous technological breakthrough that we need to encourage; obviously you have to surround it with appropriate environmental safeguards,” Pataki told Breaking Energy in a recent interview.