The U.S.S.R. figured out how to Survive Thermo Nuclear World War 3.   The reason why the bomb shelter business collapsed was the U.S. Citizen's strong belief in Mutually Assured Destruction.  While the U.S.S.R. increased their Anti Ballistic Missile Capabilities around Moscow, created the Ural Mountain Complex (a series of Under Mountain Cities, construction started during the 1950s) previously classified from U.S. Citizens Knowledge (don't panic the Sheeple), the Muslim Nation of Iran and the Democratic Republic of North Korea have recently built Under Mountain Nuclear Attack Proof Cities.