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Sardinia

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Since astronauts must learn to adjust to dark, isolated and confined spaces, scant equipment, privacy and supplies--where better to practice for the deprivations of life in space than deep underground? Because navigating safely in a cave requires tethering, 3D orientation, with no-touch areas (statlactites, stalagmites) and treacherous no-go zones, it can provide many of the same technical challenges as a spacewalk.

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