MARSIS Radar Calculates Water on Mars

For the first time in the history of planetary exploration, topographic maps of the Martian sub-soil have been produced, revealing considerable volumes of ice. The Marsis low frequency radar has been designed so that its signals penetrate into the Martian sub-soil. Consequently, its radar signals can reach a depth of more than two miles, which has made it possible to map the boundary between the layered deposits and the floor of the basin.