Before revision: With construction beginning in the early 1980s (during the cold war ), the shelter was designed to accommodate as many as five hundred people for the length of time required to allow the widespread nuclear fallout to decay to a level allowing a safe return to the surface after a cataclysmic nuclear event.
After revision: With construction beginning in the early 1980s (during the Cold War ), the shelter was designed to accommodate as many as five hundred people for the length of time required to allow the widespread nuclear fallout to decay to a level allowing a safe return to the surface after a cataclysmic nuclear event.