A pair of simultaneous nuclear explosions, one more than 1.6 miles underground and the other 1,000 feet above it, have been proposed as a way to extract huge quantities of natural gas from subterranean rock. Each blast would be … about 2.5 times the size of the bomb used at Hiroshima. By breaking up tight gas-bearing rock formations, a flow of presently inaccessible gas may be made available.… A single-blast experiment, called Project Gasbuggy, is already planned. — Science News, December 17, 1966
On December 10, 1967, Project Gasbuggy went ahead, with a 29-kiloton nuclear explosion deep underground in northwestern New Mexico. The blast released natural gas, but the gas was radioactive. The area is still regularly monitored for radioactive contamination. Today, natural gas trapped below Earth’s surface is often extracted via fracking, which breaks up rock using pressurized fluid (SN: 9/8/12, p. 20). Though less extreme, potential links to drinking water contamination and earthquakes have stoked fears about the technique.