Semi-submersible structure, such as a drilling apparatus is passed through and which can be moved to the place of use conditions, in place of use, for example, it has a semi-submerged state, which can be used with great stability in operations such as drilling. This structure is used to transport the removable equipment, such as a consumable solid or liquid material, the drilling tube, such as mud. Doemeurosseo the consumable equipment and removable equipment are removed from the structure in use, it reduces the overall mass of the structure. The structure of claim ballast to compensate for the first bank set (66, 68, 70, 71, 84, 86, 88) for pantun means of a built-4, 8, and removal of a consumable material for the consumable material It includes ballast control means for deriving the first bank set. The structure includes a ballast tank, but the arrangement is made such that follows. That is, the first bank set is empty and if it is not a consumable material or removable equipment transferred to the structure, it is not locked to it filling the ballast tanks with ballast structure enough to attain the semi-submerged state, the state It should be made so that it can be achieved if the means of the first bank at least partially filled. Thus, the structure reduces the effective deck load of the structure by including a "dual purpose", which can accommodate the consumable material and ballast.
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