This is a book about the Arctic secrets left to us by the Third Reich after World War II. It’s hard to imagine, but during the war years, in the waters of the Northern Sea Route, the banks of Siberian rivers and Arctic archipelagos, the Nazis felt almost like masters. Our research shows that in the Soviet Arctic there were many secret German bases and strongholds of the Kriegsmarine and Luftwaffe. This book is based on the memories of direct participants in the events described. You will read about the collapse of the Third Reich, the escape of Hitler, his doubles and proof of the existence of Antarctica; about the mysteries of the flight of the Graf Zeppelin airship and Operation Wonderland; how the war took place on the routes of the Soviet Arctic and the death of the North Sea submarine "Decembrist"; about the secrets of the underground base of the “gray wolves” on Alexandra Land and the Kriegsmarine fuel base at the mouth of the Lena.