Abstract. In 2019, in the northern part of the Kara Sea shelf, in an area located near Uedineniya Island, engineering and geological surveys were carried out. These activities included seismic survey using high and ultra-high resolution methods, seismoacoustic profiling, and drilling. As a result of the work, it was determined that in the upper part of the section to a depth of 100 m from the seabed, sandy-clay lower Cretaceous Albian sediments are developed, as well as Quaternary formations represented by marine Holocene very soft (liquid) clay-silty clays, marine-alluvial-marine Karginsky soft to firm clays and marine Kazantsevo firm-stiff lean clays. The report presents the characteristics of the identified seismic complexes, data on the grain size composition, physical, strength and deformation properties, salinity of the sediments exposed by the boreholes.

Keywords: Albian sediments, bottom soils, soil salinity, lower Cretaceous sediments, North Kara shelf, seismic stratigraphy, Quaternary sediments, soil properties