RSL has been the center of many studies of various groups over the past years. There are now a number of theories that were lobbied with regards to the occurrence of RSL. One of which was the idea that the streaks were a result of sand flows on the surface. Some suggested that the streaks were caused by the seeping saltwater that is just below the Martian surface but shallow pools of groundwater have not been found or identified in radar experiments.
The duo's different perspective on the Martian RSL came from their backgrounds in studying aquifers and groundwater flow in the different desert environments on Earth. The similarities between Earth and Mars fueled their paper. Their hypothesis is that water can be found at about 750 meters (about half a mile) into the surface of Mars. Due to the high pressure, the liquid is being forced up through the soil, finding its way through fractures and cracks on the surface.
