Inner Earth Beauty Unveiled During Astronauts' Cave Training | Video
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Published 4 years ago
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During the CAVES 2013 mission, astronauts from NASA, ESA and CSA spent two weeks in the dark, cold and serene interior of the Sa Grutta cave in a Supramonte mountain in Sardinia to simulate Mars-like exploration.
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alienconspiracy theoryconspiracypredictionhollow earth
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