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This paper reports the results of investigations in September 2017 on the radioecological state of bottom sediments of the East Siberian Sea during integrated research of the Siberian Arctic seas on cruise 69 of the R/V Akademik Mstislav Keldysh. Evaluation of the results of γ-spectrometric analysis found that the current specific activity of artificial cesium-137 in sediments is two orders of magnitude below the acceptable level and reflects the influence of global fallout from the atmosphere only. Sediments are not contaminated with heavy metals either. Bottom sediments are represented by silts: pelitic, aleuritic–pelitic, and fine aleuritic with a content of pelite (<0.01 mm) fractions of 40–80%. The western and eastern parts of the East Siberian Sea have differences in the distribution and composition of mineral components and element composition due to the influence of the catchments of the Indigirka and Kolyma rivers, respectively. [ABSTRACT FROM AUTHOR]

The 44th cruise of R/V Akademik Boris Petrov was carried out from October 5 to 30, 2018 in the Baltic Sea and Skagerrak Strait. The studies included investigation of the water column structure, bottom currents, bottom sediments, and biological communities. [ABSTRACT FROM AUTHOR]

The paper provides information about a complex of geological studies in Chaun Bay in the East Siberian Sea during cruise 60 of the R/V Akademik Oparin in October 2020. Preliminary results of the scientific expedition are discussed. [ABSTRACT FROM AUTHOR]

New data on the formation of the bottom topography, bottom sediments, spatial structure and dynamics of waters of the Baltic Sea were obtained in cruise 42 of the R/V Akademik Nikolaj Strakhov (August 17–27, 2019). The distribution, morphology, and structure of large sand bodies on the Rybachy plateau were obtained. Additional data on the formation of the bottom topography and sedimentation under the influence of iceberg exaration and ice rafting at all stages of the Baltic Ice Lake were obtained. Numerous active gas craters (pockmarks) have been identified in the central part of the Gdansk Deep. [ABSTRACT FROM AUTHOR]

First results of the multidisciplinary expedition onboard the R/V Akademik Nikolaj Strakhov in the Barents Sea in August–September 2018 are presented. Hydrophysical sounding has been carried out on 41 stations, sampling of bottom sediments has been done using both grab and gravity corer. As a result of the geophysical investigations, areas with manifestations of current dangerous natural processes are identified. Four seismic bottom stations have been installed in the Pechora Sea. [ABSTRACT FROM AUTHOR]