UNDERWATER ARCHAEOLOGICAL EXPEDITION NEAR THE TOWN OF KAVARNA (Asen Salkin – darina_mircheva@abv.bg, Penko Georgiev) Remains of a sunken quarter of Roman Bizone were discovered during the underwater archaeological explorations in the harbor of Kavarna. A collapse of numerous stone blocks was located in the harbor, at 6 m under the sea level. A marble male head from the Roman period and a base of a column were found during the previous underwater explorations. A well-preserved ancient millstone, an axle of a stone door, parts of a wall built of bricks, a profiled quadrilateral block with an opening in the middle and grooves on its sides, and numerous fragments of dolia were discovered during the present explorations. Presumably, a large administrative building, storehouses or a harbor construction (a wall of a quay) existed on that place during the Roman period. Similar transgressive and regressive processes from the 1st century BC to the 2nd century AD were registered on the coast of North Dobrudzha in modern Romania. An active movement of the land in that part of the Black Sea coast happened in that period.