The underground shot that we fired, the first of its type in the end of the '50s, was the beginning of a discussion of using explosives for the purpose of displacing big masses of earth, digging harbors, digging canals - the idea was taken up in a very effective way, quite probably independent of Los Alamos, independent of Livermore, by the Russians. I want to tell you of the name of the thing. It was established in connection with the Nobska Conference that I have mentioned where a group of us, of our people from Livermore got together with a group of people of Los Alamos. We told them about our intention of turning weapons into peaceful uses, turning swords into plowshare. It was an expression used by our friends in Los Alamos in derision, as an objection, but we liked it and we called our effort to use nuclear explosives in a peaceful way Plowshare. We happened to know that the Russians did a great deal in the same line. One remarkable thing they did, of a kind that we never duplicated, was connected with natural gas. In their working with natural gas they got into trouble in fires, by accident, where the streaming gas from underground gave rise to a flame so powerful that they did not quite know how to extinguish it. What they actually did was to drill down next to this gas well, make quite a sizable nuclear explosion, not at the place where the gas was coming out, but near by, which shoved a mass of earth over the source of gas and actually put out the flame.