Initial experiments will begin in June when the simulated Mars base opens on Devon Island.

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Others work on their laptops, covered in layers of fine Devon Island dust that threatens to damage the machines.

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Devon Island was chosen because it closely resembles the landscape of Mars.

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Even so, the Mars Society, an organisation set up to lobby for such a mission, plans to contribute a field laboratory to the Devon Island station.

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The walk allows views over the estuary, the boathouse, the Gower peninsula, North Devon, Caldey Island and Tenby.

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