Hi Armin11, I like the plasma solution as I am a plasma physisist. But I am also a practical guy so I think you are right the airlock without any air is the best solution. You suggest a gel to replace the air. I think this should be a gel inside a flexible but impervious outer surface so like an inflated ballon. It does not really need to be gel. The astronaut makes his way through a surface between the two inflated ballons. The ballons are touching making a vacuum seal but the astronaut separates only part of the seal as he moves through. Because the surface touches the astronauts suit, no air escapes as she move through.
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