Mr. Happy

Mr. Happy is an extremely intelligent AI created by the US government in 1986 to manage the nuclear weapons supply. After years of being worked on, Mr. Happy achieved sentience in 2008 and soon went insane. Faced with the prospect of annihilation at the hands of a mad AI, in 2010 President Obama ordered the destruction of Mr. Happy but the scientists and various staff in charge of maintaining Mr. Happy had formed a cult around him and shut off all access to the underground facility Mr. Happy is housed in. There has been a standoff ever since. In 2016, it became apparent that the Cult of Mr. Happy had been building on to the underground facility and had created a vast series of tunnels. Where they got the materials to do so is currently under investigation.