An offshore structure having a UBD system is disclosed. An offshore structure provided with the UBD system of the present invention includes a deck; And a drilling fluid designed to have a pressure lower than the pressure of the seabed layer provided on the deck of the stern area of the hull and intended to be drilled, pulverizing the solid contained in the well cutting stream of the drilled well, And a UBD system equipped with a hammer mill unit for separating into separations including gas,
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