(aka: Subway to the Unknown)
Life on Xul becomes hellish because scientists, with their nuclear tests, have deprived the world of the benefits of the sun. Some people go to take refuge underground. Then an Earth ship arrives.
Publication history in print:
- Métro pour l'inconnu (aka: Subway to the Unknown) (published in Urania #253 (Apr, 1961) magazine in 1961)