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3D model of Tiscali cave stalagmites in Sardinia, Italy, made by the team of astronauts taking part in ESA’s underground training mission CAVES 2016. This model was made using photogrammetry, a three-dimensional survey technique using photographs that could also be used on other planets, for example to study lava tubes on Mars. Visit the CAVES blog to follow the 6-day underground adventure:http://blogs.esa.int/caves