Research ship "Gidrobiolog" of the Sevastopol base "Gidronaut" in scientific expeditions in the Black, Arabian Seas. Descent of the ship, immersion in the water of the underwater research vehicles "Rif", "Omar", "Pentos". Hydronauts-researchers in underwater vehicles for underwater research. Underwater photography of underwater flora and fauna. The tasks of underwater research in the Black Sea are discussed (synchronously): the chief specialist of the Gidronaut base, the hydronaut-researcher V. P. Petrov, the hydronaut-researcher D. V. Semenov, the head of the biological resources laboratory of the Institute of Biology of the Southern Seas of the Academy of Sciences of the Ukrainian SSR, Doctor of Biological Sciences G. V. Zuev, head of the sector of biological resources of the base "Gidronavt" D. K. Gutsal, chief specialist of the base "Gidronavt", candidate of biological sciences A. Yu. Podosinovikov, deputy director of the Institute of Biology of the Southern Seas of the Academy of Sciences of the Ukrainian SSR V. N. Egorov. Captain-mentor OE Donets tells (synchronously) about the training of specialists of underwater vehicles.