And enough of it to cover it completely to a depth of 11 meters! Not only does this make a Mars base much easier to maintain - you can get all sorts of things you need from water like oxygen for example, but it also makes Terraforming it a much easier possibility too! The Terraforming project wil be outside my lifetime, but it is still a cool possiblity!
http://www.cbc.ca/technology/story/2...-20070315.html
-S