Two operating ultra-deep continental drilling sites in Russia were visited: the hole SG-4 (depth=5, 355 m) at Kushva in Ural mountain and the hole SG-6 (depth=7, 502 m) near Hobih Urengoi, Western Siberia. The drilling rigs of these wells are very similar to that of the world-deepest SG-3 hole (depth=12, 261 m) in the Kola Peninsula.