Vessel for removing offshore structures

A vessel 1 for lifting and transporting an offshore jacket structure (15, Fig 2) comprises a ballastable main buoyancy section 2 and two auxiliary buoyancy sections 3 protruding in the same direction on either side of the main section. The main buoyancy section is generally planar and has in plan view the outline of an isosceles triangle with an extension 4, 5 at the apex. The extension forms the fore part of the vessel and the base of the triangle 8, 9 forms the aft part. The auxiliary sections are located at opposite ends of the base. Through suitable ballasting the vessel may be rotated while in contact with the seabed into contact with the jacket structure, before being rolled back to an initial position with the jacket structure attached, before it is brought to the surface. The vessel may be made from stiffened flat steel plates.