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A plant extracts water from the surface of Phobos using a nuclear-powered rock-melting device. Contaminates in the water vapor are removed in chemical process units located on a boom 50 meters above the rock-melter. Aided by the low surface gravity of Phobos, the whole process plant moves on legs equipped with end effectors. Cryogenic oxygen/hydrogen could be used as propellant for Mars lander vehicles and for life support.