Battered buildings. Freezing rains. Endless sunlight. Despite facing such hardships, scientists simulating life on Mars have pushed the limits of red planet science on a barren island in the Arctic. Taking part in their first research expedition to Devon Island, a Canadian hinterland with haunting similarities to Mars, a handful of Mars Society members are trying to salvage their primary mission this week.The group had planned to construct and live in a prototype Mars habitat. But their hopes were dashed earlier this month when a fifth and final cargo airdrop by a U.S. Marines cargo plane damaged part of the structure.