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During the mission, he tested an experimental spacesuit and a new cost-saving protocol to exit and re-enter the spacecraft without using an airlock.

As the lorry drove towards the airlock - a secure area between the inner and outer gates of the prison - Khalife heard one of the kitchen staff asking: “Where is that young boy?”

As Dragon doesn't have an airlock, the crew were exposed to the vacuum of space during the spacewalk.

In recent decades astronauts used an airlock that separates most of a craft from the space vacuum outside - but this SpaceX Dragon capsule was in effect entirely exposed to space outside.

Due to the lack of an airlock on the Crew Dragon, the 13-foot-wide capsule will be depressurized and exposed to space during the walk.