Despite its doomsday-defying role, it was built by a country that in 1950 was invaded by the neighbouring North, and Pyongyang has since developed a nuclear and missile arsenal. The facility was built in the "safest spot" in South Korea, Lee said, designed to withstand a 6.9-magnitude earthquake and even an atomic strike. "It's geographically very safe," Lee said. "And we paved a 46 metre-deep underground tunnel to ensure it's safe from war and nuclear threats.
AFP