Blue Dot VR is an immersive experience which aims to make you believe that you are actually in space. To achieve that, we need to provide all necessary sensory inputs. The sense of weightlessness is a very critical component of those different inputs. To replicate it, we quite literally immerse you in water and utilize special techniques to make you feel like you are floating in the void.
Hey, even NASA uses this to train their astronauts.
Check it out.