More than two thousand years, one hundred thousand slaves worked in the mountains piercing the prosperous Roman colony of Carthage, in search of silver. Portman Bay, then "Portus Magnus", started the galleys to the metropolis, laden with the precious metal. Since then, the mountains, the bay and the people have gone through a delicate balance, which broke with the advent of modern mining and construction Robert Sink, the world's largest in its field. Today, the beautiful bay of Portman is saturated with millions of tons of toxic waste from washing the ore.