Researchers from the University of Nottingham have used 3D scanning technology to uncover a secret room hidden inside a building used by conspirators in the Gunpowder Plot of 1605. The hiding hole was used by Catholic priests escaping persecution in the 17th century.Following the English Reformation of the 16th century, in which the Church of England broke away from Catholicism, many Catholics who wanted to continue practicing their faith had to do so in extreme secrecy—or else face execution as traitors. Consequently, many owners of large country houses devised clever methods of hiding Catholic clergymen, often by creating so-called “priest holes” in the various nooks and crannies of their properties.