There are some new rather surprising discoveries about water on Mars. Well,
the first one is already older - it tells that the southern polar ice cap contains enough water to cover the entire planet approximately 36 feet (11 meters) deep if melted, according to a new radar study. That alone is already a serious amount of water, but lately (
published on 1 November 2007), ESA's Mars Express probe discovered possible massive deposits of water ice (up to 2.5 km thick) right near the equator - which is quite surprising and scientist have problems believing it - normally ice on Mars equator would quickly evaporate in Mars atmospheric conditions, so it must be covered by several meters of sediments and dust to be preserved.
So altogether, it seems there is enough water on Mars for a decent diving.
image credit © ESA - Mars Express