One of the 3d photogrammetry models realized by the astronauts Ricky Arnold, Pedro Duque, Ye Guangfu, Aki Hoshide, Jessica Meir and Sergey Korsakov during the ESA Caves training course in Tiscali cave (Sardinia, Italy).
For more information see this links:
http://blogs.esa.int/caves/
https://twitter.com/ESA_CAVES
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