The film showcases the ascent of a 300-meter-diameter stratospheric balloon, which reaches an altitude of 42 kilometers. This mission, part of the Stratos program developed since 2011 by the CSA and CNES, provides viewers with a unique perspective of Earth's curvature and the thinness of its atmosphere. The VR experience allows audiences to virtually accompany the balloon on its journey, offering a rare glimpse into the stratosphere.