Below Scotland`s capital, hidden for almost two centuries, is a metropolis whose very existence was all but forgotten. For almost 250 years, Edinburgh was surrounded by a giant defensive wall. Unable to expand the city`s boundaries, the burgeoning population built over every inch of square space. & when there was no more room, they began to dig down.. . Trapped in lives of poverty & crime, these subterranean dwellers existed in darkness & misery, ignored by the chroniclers of their time. It is only in the last few years that the shocking truth has begun to emerge about the sinister underground city.