During the depths of winter, just a handful of flights land each day at Salekhard airport, inside the Russian Arctic Circle.
As temperatures plunge below -30c and semi-permanent darkness shrouds the bleak tundra landscape, few outsiders willingly venture there. Among them are oligarchs, who make the three-hour trip from Moscow on private jets to hunt for reindeer and wolverine.
Unwilling arrivals are brought by cattle-class train, a journey that takes 45 hours, and decanted at FKU IK-3, otherwise known as