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New Mars study suggests an ocean’s worth of water may be hiding beneath the red dusty surface
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I do believe that the vast majority of life on earth is underground, and that the most likely place we'll find other life in the solar system is underground. Perhaps we'll discover that life is common but rarely comes to the surface, which is generally the most hostile part of a planet.
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What about getting water from the Oort cloud? Assuming you just chuck watery comets at Mars instead of landing and taking off, I wonder if that would actually be less energy intensive than mining for water on Mars.
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Hmm, it only takes 200 years for comets to reach the inner solar system, which isn't significant for any realistic time frame of Martian terraforming, I think. Furthermore, given that the Oort Cloud is so far from the sun, the dV to send things to the inner solar system is actually very low. The objects in the Oort Cloud are probably only orbiting at a speed ranging from 500 m/s to as low as 100 m/s. So especially for distant objects, you only need to slow them down a little to get them hurtling towards Mars.