Note: An adventure story teeming with speculative elements : a Lovecraftian atmosphere reminiscent of At the Mountains of Madness, including a forgotten, mysterious underground city below the plateau of Leng, featuring bizarre — not to say alien — statues and frescoes; friendly yetis; and an evil "empire asiate" (Asiatic Empire) regrouping most far-eastern countries and plotting against the rest of the world, thanks to rockets equipped with "stellar statoreactors". This "empire asiate" bears a strong resemblance to Basam-Damdu's Lhassa-based "Empire Jaune" (Yellow Empire), in Edgar P. Jacob's Le Secret de l'Espadon (1950), a famous Belgian graphic novel. Other speculative allusions include a reference to James Churchward's theory about the lost continent of Mu; the name of the Buddhist monk, Lobsang Rabang (echoing that of T. Lobsang Rampa); and the subtitle of the book, "Les cavernes d'acier", a clear hint at Isaac Asimov's Caves of Steel.