Scientists have discovered a massive amount of water ice buried under the south pole of Mars. Supposedly they've found enough to cover the whole planet to a depth of 30 feet. Strangely, this huge amount isn't large enough to explain many of the geological signs of water that have been found. However, this would appear to be only the first dataset from the last-to-be-deployed MARSIS radar probe installed on the Mars Express orbiter. Scientists will next try to measure the north pole, and then as much of the rest of the planet as they can. Who knows? It may all still be there.