Not a nasty, dirty, wet hole, filled with the ends of worms and an oozy smell, nor yet a dry, bare, sandy hole with nothing in it to sit down on or to eat: it was a hobbit-hole, and that means comfort.

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He made his way to the faucet in the corner, where he drank deeply of the sweet water and peed, first removing from the sink a wet bedsheet with a large black-rimmed hole burned in its middle.

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Curiosity has already seen plenty of evidence for past running water in Gale Crater and the results from the drill-hole analysis are expected to reveal further information about that wet history.

BBC: Curiosity Mars rover takes historic drill sample