Abstract: The anchor comprises a shank and a rocker which is mounted in the vicinity of one end of the shank to pivot about an axis perpendicular to the shank and to the rocker and which has two equal branches constituting the arms of the anchor. Each arm carries at its free end a ploughshare whose convergent end portion faces the other end of the shank. The convex faces of the two ploughshares are disposed in confronting relation. In operation, the anchor operates in the same way as conventional so-called "plough" anchors in hard grounds, whereas the two ploughshares sink into and simultaneously operate in very soft grounds.