North Korea's main source of uranium has been hit by a series of cave-ins and a tunnel collapse is so severe that it can be seen from satellite photos - dealing a blow to Kim Jong-un's nuclear weapon ambitions.
Jacob Bogle created a comprehensive map of the country from space and discovered the collapse in recent images of the Pyongsan mine.
The mine is the regime's main source of uranium ore, which can be refined into yellowcake and ultimately weapons-grade uranium.
