Free Solo star Alex Honnold makes an appearance in this documentary as he is on another free solo climb before his El Capitan climb
This started life when the Australian Chamber Orchestra - a company noted for its artistic collaborations - approached Jennifer Peedom about working together. She was about to go off and make Sherpa (2015) so it had to wait until she had completed that film.
The film was conceived in tandem with the Australian Chamber Orchestra with the view that the music be played live.
One of the problems with shooting in the Himalayas is that you can't use drones as the atmosphere is too thin to sustain them.