Long, dome-like structures camouflaged by a rural landscape conceal the remains of concrete vaults with a hidden history; experts investigate and uncover state-of-the-art bunkers built to conceal and protect a deadly nuclear secret. Stories: 1) Malcha Mahal, Delhi, India; 2) Former USAF Base, Greenham Common, England; 3) Kempton Park Hospital, Johannesburg, South Africa; 4) Cumberland Island, Camden County, Georgia