These are specialized offshore mooring anchors, that also fall under the category of drag anchors. They are specialized, since their main use is in dragging oil rigs. But they are also versatile, because their shape and functionality allows them to be operated by crane vessels, certain types of buoys, and even in dredging. They come in different sizes. You can adjust their steering angle, in order to adapt to different types of terrains. This combined, makes them extremely popular in Norway and Norwegian Offshore drilling operations.