APPARATUS AND METHOD FOR RECOVERY OF MARINE STRUCTURES
For the recovery of an underwater structure (1) of tubular form, such as a jacket of a decommissioned oil rig, a lifting attachment (10) is inserted into a free end (2) of a tubular member of the structure (1), and is then plastically deformed by hydraulic forming so that it engages mechanically and securely with the inside of the tubular member, which is at least elastically deformed. The structure (1) can then be recovered to the surface by means of recovery cables (45) attached to a lug (14) on the lifting attachment (10). This saves having to weld attachments to the structure.