Seagoing vessel with a load-bearing module, which is supported by a pair of spaced-apart the hull by the legs. Legs, in order to provide control of distance between the two hull, and in order to control the height of the module from the water surface, which is articulated in two places. Dynamic control of the articulated section may control the ship's response to such oceanographic conditions. Legs, such as by ensuring that the bow of the hull does not increase excessively, can be used to enhance to aid in buoyancy and / or stability, a fixed or controllable it may be provided with an aerodynamic surface. Hull is preferably at least partially expandable, techniques for attaching a flexible fuel tank for inflatable boats inner shell that is present is disclosed. Further, modular pressure control system for controlling the pressure in the inflatable boat inner shell having a plurality of separate inflatable compartments are also disclosed.