FIELD: performing jobs in freezing seas at depth "H". SUBSTANCE: vessel has hull rotatable relative to bearing swivel ring mounted inside it and secured to bottom by means of anchor system. Bearing swivel ring is provided with chain lockers. Anchor system includes chains secured in chain lockers at one end, anchor mechanisms and guide members mounted on bearing swivel ring. Length L1 of anchor chains exceeds length L of anchor chain sufficient for securing ship at sea depth "H" at anchorage by magnitude no less than depth of sea "H". EFFECT: extended range of application of drilling vessel. 1 dwg
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