Abstract: A cargo vessel which can be used in either or both of a roll on/off and a lift on/off mode, provided with a cargo hold which is covered with an inner bottom plating, a second deck, an auxiliary deck, an exposed deck, and having a plurality of transverse frame structures within the hold which are suitably spaced apart from each other and which have openings adapted to be opened or shut according to the use in roll on/off or lift on/off mode, such frame structures when open not interfering with free movement of roll on/off traffic around the decks, all hatches except a hatch having a liftable loading platform being closed by hatch covers, the front end of a movable slope-away being connected to the rear of the decks for use in the roll on/off mode, and the openings of the frame structures being closed by cover plates and the loading platform being lowered to the inner bottom plating for use in the lift on/off mode.