Here’s a riddle. Why do a group of explorers who discovered a hoard of cash worth between US$18m and US$33m in a disused mine in Russia still have to go to work every day? Because the money belongs to someone else? Because they had to hand it over to the state? None of the above. The cash they found was denominated in Soviet Union banknotes that were issued between 1961 and 1991 and are therefore no longer legal tender in the Russian Federation. The group from St Petersburg, who explore and blog about abandoned sites across Russia, trekked through rough terrain in Russia’s Vladimir region to investigate rumours of a hoard of cash that had been hidden in old missile silos located near Moscow. Despite the rumours no one had dared to go near the site for fear of being exposed to radiation as the silos were believed to be part of the Soviet Union’s nuclear missile programme. A Geiger counter however showed there was nothing to worry about, so the team entered the mine, which had in recent years been flooded, and found the fortune. Team member Olga Bogdanova said that the sight of such “riches” was difficult to convey in words. “There’s delight and some sadness, because you realise that this is a bygone era which will never return, that all this money would have been more than enough for anybody”. Better luck next time.