Although only 11 minutes in length, the documentary manages to touch on everything from the sounds of Krypton (ball bearings and BBs being tumbled onto a children's xylophone, for instance, provides the audio for the alien race's computer monitors) to a hidden Easter Egg of the wind's whoosh from George Reeves' 1950s Superman television series.
The most interesting description of Snyder's mindset comes from the film's supervising sound editor and designer, Scott Hecker. He says the director uses "sound as a weapon". That's certainly on full show for the final 40 minutes.
"In the pantheon of superheroes, Superman (Henry Cavill) is the most recognized and revered character of all time. Clark Kent/Kal-El is a young twenty-something journalist who feels alienated by powers beyond his imagination. Transported years ago to Earth from Krypton, a highly advanced, distant planet, Clark struggles with the ultimate question 'Why am I here?' Shaped by the values of his adoptive parents Martha (Diane Lane) and Jonathan Kent (Kevin Costner), Clark discovers having extraordinary abilities means making difficult decisions. When the world is in dire need of stability, an even greater threat emerges. Clark must become a Man of Steel, to protect the people he loves and shine as the world’s beacon of hope – Superman."
Man of Steel is out in cinemas now.