a catamaran lifting apparatus is disclosed for lifting objects in a marine environment . the apparatus includes first and second spaced apart barges . first and second frames span between the barges . the frames are spaced apart and connected to the barges in a configuration that spaces the barges apart . the first frame connects to the first barge with a universal joint and to the second barge with a hinged connection . the second frame connects to the second barge with a universal joint and to the first barge with a hinged connection . the hull arrangement provides flexibility in a quartering sea state due to the universal joint and hinge placement between the frames and the hulls . each frame 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 and under the frames .