72 Hours Bridge   As Bridge of No Return was closed in the wake of the ‘Axe Murder Incident’, North Korea lost its only entrance to Panmunjom. North Korea needed to secure another access to Panmunjom. The North built another bridge that connects Panmunjom and the city of Kaesong. And this bridge is named ’72-Hour Bridge,’ because it took 72 hours for the North to build the bridge.