On 18 September 1980, an Air Force airman was conducting routine maintenance high in the missile silo at a Titan II nuclear launch complex in Arkansas. In the course of his work he lost his grip on a large ratchet socket, and it tumbled into the depths of the silo. After falling approximately 80 feet it impacted one of the nuclear missile’s propellant tanks, causing a small rupture and leak.
After assessing the severity of the leak, Air Force personnel decided to evacuate the facility. Within the hour they decided to also evacuate nearby civilian residents. Early the following morning, just after the last two airmen emerged from the silo, the fuel-saturated atmosphere inside exploded, blowing the 740-ton launch door 200 feet into the air. One of the two men who had just emerged died of injuries sustained in the blast, the other was injured. The missile’s nuclear warhead was found about 100 feet from the launch complex’s entry gate, but very fortunately its safeties were intact and there was no loss of radioactive material, nor localized atomic devastation.
Rather than repairing the launch complex–estimated at $225,322,670–the Air Force decided to bulldoze surrounding soil, gravel, concrete debris into the hole and retire the site. On 18 February 2000, Titan II Missile Launch Complex 374-7 Site was listed in the National Register of Historic Places.