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This report is dealing with the problem of estimation the damages to environment caused by the crude oil (or oil products) spills from the underwater sources. The peculiarities ofthe oil movement caused by flotation and turbulence in the deep sea were considered on the basis of assumption that the oil dispersed on the separate drops.It is showed that lthe oil which coming to the surface is divided into separate clasters in accordance with sizes of drops.The mathematical expressions were obtained that permited to evaluate the sizes of oil drops and clusters as well as oil concentration depending on time. The analysis of experimental data confirmed the theoretical results while using the diesel oil. Its drops had sizes from 0. 10 to 1.34 nun. The diesel oil concentration in clusters corresponds to theoretical predictions.

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Sailing within the ice channel that assisting icebreaker tracks is usual for difficult ice conditions in the Northern freezing seas and the Arctic region. There is the danger of emergency, namely, the collision with an icebreaker or the ahead vessel, when ones stop before insuperable ice obstacle or because the engine trouble. The paper contents analysis of the vessel braking process and formulation of the equation that gives possibility modelling this process and evaluating the distance that is necessary for safe stopping of vessel in dependence on its characteristics and ice conditions. Outcomes of investigation will be applicable for the caravan of cargo vessels forming while the icebreaker assistance.