A film about the expedition of documentary filmmakers and scuba diving athletes along the Black Sea and the coast on a catamaran. Black Sea. Landscapes. Catamaran at sea. Berezan Island. Kinburgskaya spit. Camp of the expedition participants. Underwater shooting. Lighthouse on the Tendra Spit. The ancient city of Chersonesos. Archaeological excavations. Expedition of Professor Blavatsky in the Chersonesos Bay. The members of the expedition raise amphoras from the bottom, explore the underwater vegetation, the strength and speed of underwater currents. Diving work to raise a sunken ship. Lifting and defusing mines. Types of the Crimean coast. Swallow's Nest. The movement of the motor ship "Russia", fishing vessels. Dolphins in the sea. Shooting of the film "Amphibian Man". The seaport of the city of Odessa.