Also, although we know there is water ice at the poles, it's locked under a cap of frozen CO2 between 1 and 8 meters thick. This sub-surface water ice between

Also, although we know there is water ice at the poles, it's locked under a cap of frozen CO2 between 1 and 8 meters thick. This sub-surface water ice between the polar regions is comparatively much more accessible, only 2.5cm below the surface in some cases.