Jerusalem Yields natural waterworks

For more than 100 years, archaeologists and historians have puzzled over the haphazard routes, slopes and dimensions of two underground water supply systems discovered beneath the remains of ancient Jerusalem. Although most researchers regard the subterranean waterworks as the products of early, error-prone engineers and construction workers, a new analysis indicates that residents of the holy city skillfully altered a natural network of underground channels and tunnels to ensure a dependable water supply. [Archaeology] [Images of selected sites in Jerusalem]