This sports center in Finland is hiding a secret. It may contain badminton courts, a boxing ring, and gym equipment, but it's also designed to keep 7,000 people safe in the event of a nuclear attack. >> We have the basic radiation dose meter, iodine pills for radiation, safety equipments, gas masks.This is Luola, Finnish for cave, a dual-use emergency shelter built into the bedrock of a cliff just 100 miles from Russia. >> This is the largest motor shelter uh that is at least here in Finland, probably in th ...