In 1852 a giant rock mass in Dorchester, Massachusetts, was dynamited. After the explosion, workers found a curious metallic artifact among the debris, which was broken in two. Upon joining the two pieces together, they revealed a vessel in the shape of a bell with a base of 6.5 inches and height of 4.5 inches. Later they discovered that the vessel was made from a silver alloy. Curiously, this artifact, seemingly constructed with a high level of technology, appears to have been trapped in the rock while it was forming several millions years ago—when humans did not even exist.