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SpaceX Polaris Dawn live: non-professional astronauts prepare for first privately-funded spacewalk

Billionaire Jared Isaacman and fellow passenger to take part in first privately-funded spacewalk

There is no airlock in the capsule. In a few moments, it will be completely depressurised and the whole crew – including the two who will remain inside – will rely on spacesuits for oxygen.

Isaacman and Gillis will exit but be tethered via what is call an “umbilical”. These are 12 feet long and provide air and cooling, plus as a SpaceX commentator just said, to make sure “they are not gonna go floating off into space”.

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