a catamaran lifting apparatus includes first and second vessels that are spaced apart during use . first and second frames span between the vessels . the first frame connects to the first vessel with a universal joint and to the second vessel with a hinged connection . the second frame connects to the second vessel with a universal joint and to the first vessel with a hinged or pinned connection . the catamaran hull arrangement provides longitudinal flexibility in a quartering sea state due to the unique universal joint and hinge placement between the frames or trusses and the hulls or barges . each of the frames extends upwardly in an inverted u - shape , providing a space under the frame and in between the barges that enables a marine vessel to be positioned in between the barges . an object that has been salvaged from the seabed can be placed upon the marine vessel .