Abstract: The disclosure of the invention pertains to a multipurpose ocean carrier into which a full cargo of barges or other vehicles can be loaded by first submerging the carrier to a point where the lower deck of the carrier is submerged deeply enough to allow barges to be floated through a lower opening in the hull through an elevator well onto the lower deck. When the lower deck is filled, the barges are floated onto an elevator platform and lifted thereby into alignment with the upper deck onto which the barges are towed by an overhead towing device. Rollers are provided on the elevator platform and the upper deck to facilitate the towing of the barges and the rollers are lowered below the surface of the platform and the upper deck after the carrier has been loaded.