UNDERWATER ARCHAEOLOGICAL OBSERVATIONS IN THE SOUTHERN HARBOR OF MESAMBRIA (Nayden Prahov – naydenprahov@yahoo.com, Kalin Dimitrov, Todor Marvakov) The dredging works in southern harbor, carried out by a floating crane Giant, were observed. The dredging area was c. 400 m long and up to 100 m wide. A layer was documented, containing Late Classical, Hellenistic, Late Antique and Mediaeval sherds. The Hellenistic sherds prevailed, including from amphorae of Rhodes, Thasos, Knidos and the Solokha Type. The finds included a terracotta brazier, a quern and a handle of a Rhodian amphora with a producer stamp of Soteridas of 233 – 220 BC.