Plan of the inner and outer harbor areas at Cosa. PORT continued A dock at the inner harbor at Cosa, with the outer collecting basin of a fountain house.A sectionof the polygonal retaining walls of the harbor embankment can be seen left and right The view looks west. meter eighty below the present sea floor. We also found that the rocks of the breakwater extensions extend down to the ancient level and do not rest on any solid foundation. The probable entrance into the outer harbor from the sea would appear to be between 206 breakwater extensions D and F where an unobstructed channel, forty-two meters wide, was "felt" with the jet prober. Excavation by both the cylinders and airlifting alone uncovered sherds mainly of amphorae identifiable as Dressel Type I, suggesting that the