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A study released on August 12 suggests that there may be a vast reservoir of liquid water below the surface of Mars, based on data from NASA's Mars InSight lander. Researcher are suggesting that Mars, which lost its atmosphere billions of years ago, might still harbour significant quantities of water trapped beneath its surface. The amount of water could potentially fill an ocean 1-2 kilometers deep. On Earth, where there's liquid water, there's life—even deep underground. Could the same hold true for Mars?