Another #space – int team of astronaut explorers go deep under Earth's surface on @ESA_CAVES expedition #CAVES2016 https://t.co/ep3324UGW3
— ESA (@esa) January 4, 2017
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Another #space – int team of astronaut explorers go deep under Earth's surface on @ESA_CAVES expedition #CAVES2016 https://t.co/ep3324UGW3
— ESA (@esa) January 4, 2017