Abstract: A method and apparatus for a barbed anchor pile is described in which a pile, having horizontally placed barbs, is driven into the seafloor. Once it is buried to a predetermined depth, the barbs are spread outward into the surrounding soil to ensure that the pile will not be pulled out by uplift loads.

Abstract: A method and means for storing a marine riser is disclosed for relocating an offshore mobile unit from a drilling or production site. The riser is disconnected from a subsea port and lowered into an auxiliary borehole. Means are provided for the lowering and raising of the marine riser and positioning of same.

Abstract: A tension leg drilling platform of the type having a floating buoyant structure anchored to the sea floor by a plurality of vertical tendons is improved by the addition of flexbile extendable lines between the platform buoyant structure and the tendons to permit movement in the horizontal plane.

Abstract: An offshore structure which is able to withstand the ice forces imposed thereon by impinging ice sheets and other larger masses of ice wherein the structure has an upper conical portion coaxially positioned relative to a lower conical portion. The walls forming both the upper and lower portions are inclined at an angle to the horizontal to receive ice masses moving into contact with the structure. The angle of inclination from the horizontal of the upper portion is greater than the angle of inclination of the lower portion, and the cross-sectional diameter of the upper conical portion is no greater than that at the top of the lower conical portion.