The urban archaeology operation undertaken in Naples for the metro lines 1 and 6 was a rare and unique opportunity to investigate the coastal landscape of the ancient city. Between 2004 and 2015, archaeologists, led by Daniela Giampaola of the Archaeological Superintendence of Campania, investigated a large portion of a port basin dating back to the Hellenistic and Roman period in Piazza Municipio in front of Castel Nuovo (Maschio Angioino).In addition to the port infrastructures, the remains of seven vessels dating between the Hellenistic and the Imperial era were discovered. The paper will present a preliminary study of the characteristics of the remains of the four vessels discovered in 2013-2015 (Napoli E, F, G and H) and will suggest hypotheses concerning their original function.