Slig Barracks isn't floating. Dripik haphazardly constructed his own little "fort" out of industrial scrap. The only structures attached to solid ground are the concrete watchtowers.
As for the green light, I'm fairly certain that's just for atmospheric effect. If you want to get technical, it could be the wavelengths of color that the light puts out is screwy due to trapped gases. Or it could be that the lights are simply tinted green. A scouring of the Slig Barracks screenshots may confirm this.
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