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"Once I'd shut everything down, the interior of the Hab [living unit] was eerily silent. I'd spent 449 sols [Mars days] listening to its heaters, vents, and fans. But now it was dead quiet. It was a creepy kind of quiet that's hard to describe. I've been away from the noises of the Hab before, but always in a rover or an EVA suit, both of which have noisy machinery of their own. But now there was nothing. I never realized how utterly silent Mars is. It's a desert world with practically no atmosphere to convey sound. i could hear my own heartbeat." (p. 284)