Russian astronauts Sergei Prokopyev and Oleg Kononenko perform a six-hour spacewalk close to the International Space Station (ISS) on Tuesday in an attempt to study a "mysterious" hole in the hull of the Soyuz MS-09 spacecraft which resulted in an air leak.
Kononenko is expected to open the thermal blanket covering the patched hole and take samples that will be later studied by ground experts. He will then re-seal the hole with a new thermal insulation patch.
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