An article published in the journal “Icarus” reports the identification of traces of water in the subsoil of the Valles Marineris, the largest system of canyons on the planet Mars. A team of researchers used data collected by FREND instrument of TGO space probe, part of ESA and Roscosmos’ ExoMars program, to map hydrogen, generally bound to oxygen into water molecules, in the soil’s upper layer. The area marked by the presence of water has a size close to those of the Netherlands, and part of it is located in the valleys of Candor Chasma, in the northern part of the Valles Marineris. That marks the discovery of water in the equatorial regions of Mars, where it was believed that temperatures were not low enough to prevent the sublimation of water so close to the surface.