>How was that scene filmed?

Wirework and CGI for the hair.
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[**Syfy**](http://www.syfy.com/theexpanse/videos/all/5486) has an "Inside The Expanse" series of 'behind the scenes' videos.

In the case of this specific scene, it's shown at the very beginning of the first instalment.

[![enter image description here][1]][1]

These are also on Youtube (although region locked). 

Episode 1:

https://www.youtube.com/watch?v=d3zQyV6HzIE


  [1]: https://i.sstatic.net/lSO65.png