[pavel_lishin]

> If not enough water would be found underground on Mars, that would be really difficult to transport from elsewhere.

I was under the (uneducated) impression that there was a fair amount of water ice locked up in asteroids that are fairly easy to redirect into a Mars capture orbit.

[neaden]

"Fairly Easy" Is doing a lot of work there. Theoretically possible yes.

[bhelkey]

Mars also has two polar ice caps [1].

[1] https://en.wikipedia.org/wiki/Martian_polar_ice_caps

[pasta67]

True... I had to look if wiki has some new information, but no - as expected it is frozen ice of co2 and not h2o. Getting that h from somewhere to make water is still going to be an issue on Mars.

[bhelkey]

I don't believe this is accurate. From the wiki:

> The caps at both poles consist primarily of water ice. Frozen carbon dioxide accumulates as a comparatively thin layer about one meter thick on the north cap in the northern winter, while the south cap has a permanent dry ice cover about 8 m thick.