The anchoring system includes an arm hinged on a base fixed to the sea-bed, this arm being capable of resting at the bottom of the sea in the position for which there is no anchoring. For anchoring, the arm must be raised, which takes place by a buoy, which is of adjustable buoyancy controlled by remote control, such as through a pneumatic pipeline. When the operation is terminated, the buoy is again allowed to fill with water and drop with the arm to the sea-bed. The arm is spared the effects of swell in both the lowered and raised positions and can thus be of light structure. The invention is particularly useful for anchoring oil tankers.
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