The last time the bridge was used for prisoner exchanges was in 1968, when the crew of was released and ordered to cross into South Korea via the bridge. The bridge was actively used by the North Koreans up until the Korean axe murder incident in August 1976, at which time the United Nations Command (UNC) demanded that the Military Demarcation Line within the Joint Security Area be enforced and clearly marked. Within 72 hours, the North Koreans had built a new bridge (dubbed "The 72-Hour Bridge") on the northern half of the JSA and the original Bridge of No Return was no longer used.