If you're looking to dine in a mine and you happen to be in Finland over the next month then you're in luck. The Muru Restaurant, which normally serves its guests in Helsinki has moved into a limestone mine 80 meters underground in Lohja. Inspired by the urban trend of "pop-up" restaurants, this is perhaps the first "pop down." Owner, Timo Linnamaki, told us how business is down in the "cave."