Missing water on Mars may not have ‘escaped to space’, could be lurking underground: Study

Though some of the ancient water on Mars did escape to space, it cannot account for the bulk of water lost, the researchers said.

from http://www.firstpost.com/tech/science/missing-water-on-mars-may-not-have-escaped-to-space-could-be-lurking-underground-study-9433761.html