An assembly used in connection with an anchor, whereby, on use, the anchor comprises one or more endpieces (2) meant to penetrate into the bottom, a shank (1) from the endpiece, and fitted to the shank end a fixing holding block (8) furnished with a hole for the pulling element of the anchor. The mounting holding block (8) or similar of the pulling element is fitted to piece (9) movable along shank so that on anchoring the motion of piece (9) from shank (1) end towards endpiece (2) is prevented by a blocking arrangement (7,11) between shank (1) and the piece and lifting the anchor on use the impact of the locking arrangement is eliminated.