This is highly irregular, especially considering how big the ice deposit is. Scientists are estimating it to be the size of New Mexico. The big question is how an ice deposit can form, at search a region. But the bigger question is how id it lasts this long.
Mars does have ice deposit similar to earth, but mostly located at the poles. Like earth, its equator region is its hottest points, with little to no ice deposits found, even underground.
Jack Holt, of the University of Texas, Austin had attempted to explain this Martian phenomenon as ice deposits that collected a long time ago when Mars had tilted in a different way.
Scientists agree that planets change their tilt about every 120,000 to as much as 50 degrees. By that estimate, the region covered by the ice deposit would be alighted at the planet's Polar Regions.
"This deposit is probably more accessible than most water ice on Mars because it is at a relatively low latitude and it lies in a flat, smooth area where landing a spacecraft would be easier than at some of the other areas with buried ice," said Jack Holt, of the University of Texas. "We don't understand fully why ice has built up in some regions of the Martian surface and not in others. Sampling and using this ice with a future mission could help keep astronauts alive, while also helping them unlock the secrets of Martian ice ages."