Major Gallo's name is symbolic. In Italian "gallo" means "rooster"; in the show, Gallo is the character who warns the others of the approaching (deadly) sunrise.
First Belgian Netflix Original.
On July 1, 2020, the series was renewed by Netflix for a second season.
The series is inspired by the 2015 Polish science fiction novel The Old Axolotl by Jacek Dukaj.
The name of the airline, BE Airlines is a reference to the radioactive isotope Beryllium-10, a element created by solar flares.