Marine suction anchor

A suction anchor 1 is provided that comprises a suction chamber 2 bounded by: (i) a circumferential outer wall 3, (ii) an upper wall having a central opening, and (iii) the wall of an internal housing; the internal housing defining a passage in communication with the central opening for receiving wellhead components that may be secured to the suction anchor; the suction chamber having a minor upper portion and a major lower portion; the minor upper portion comprising internal reinforcing members 9 extending along the inside of the upper wall from the outer walls to the internal housing; the major portion being adapted to be embedded in a seabed and the minor portion being adapted to project from the seabed when the anchor is installed; wherein the reinforcing members serve both to reinforce the upper wall of the chamber against collapse and to rigidly support the internal housing such that it may resist forces applied to it arising from bending moments applied to a wellhead components received and secured therein. A method of installing the suction anchor is also provided.