Земля Санникова
Soviet authors were also interested in the distant past. Belayev described his view of "historical" Atlantis in "The Last Man from Atlantis" (1926), and Obruchev is best known for "Plutonia" (written in 1915, before Revolution, but only published in 1924), set inside hollow Earth where dinosaurs and other extinct species survived, as well as for his other "lost world" novel, "Sannikov Land" (1924).