Cavewalking

ESA astronaut Pedro Duque, NASA astronaut Jessica Meir and Ricky Arnold, Japanese astronaut Aki Hoshide, Chinese astronaut Ye Guangfu and Russian astronaut Sergei Korsakov during ESA's underground training course for astronauts in 2016.

Moving in a cave, either horizontally using cables and tethers or vertically with climbing equipment, requires continuous attention, skilful use of tools and a healthy trust in the equipment. Underground ‘cavewalks’ are similar to spacewalks because they require safety tethering, 3D orientation, staying clear of dangerous areas, and careful planning and teamwork.