A floating offshore wind turbine assembly unit useful for assembling or maintaining wind turbines at an offshore location is disclosed. The floating offshore wind turbine assembly unit may include a first vessel spaced a distance apart from a second vessel, and an extended deck coupled to the first vessel and the second vessel. The extended deck is positioned in the distance between the first vessel and the second vessel, and the extended deck is configured as a dry dock disposed or movable to a height above a sea level. In some embodiments, the extended deck or a portion thereof is movably coupled to the first vessel and the second vessel. For example, the extended deck or a portion thereof is movable between a submerged or near sea level position and a position above a sea level.

This disclosure describes hybrid chine hulls, marine vessels including hybrid chine hulls and methods of manufacturing and using hybrid chine hulls. An exemplary hybrid chine hull includes a keel, a single chine section, and a double chine section distinct from the single chine section with respect to a longitudinal direction of the keel and positioned aft of the single chine section.

A construction method for a column platform barrel deck and topside facilities, and a column platform. The construction method includes: prefabricating topside facilities in form of modules one by one, lifting each module to a predetermined position on the topmost deck of the upright barrel, and then connecting the modules to each other and forming a module-integration bottom deck at the bottom; during construction of the upright barrel, a skylight opening is reserved on the barrel topmost deck for the installation of the topsides, and the skylight opening allows the modular-integration bottom deck to be placed inside; an on-site closing gap is formed between the edge of the skylight opening and the outer edge of the modular-integration bottom deck perimeter; using the on-site closing gap connection structures to fill the on-site closing gap, so that the modular-integration bottom deck and the barrel topmost deck jointly form an integrated platform deck.

A construction method for a column platform barrel deck and topside facilities, and a column platform. The construction method includes: prefabricating topside facilities in form of modules one by one, lifting each module to a predetermined position on the topmost deck of the upright barrel, and then connecting the modules to each other and forming a module-integration bottom deck at the bottom; during construction of the upright barrel, a skylight opening is reserved on the barrel topmost deck for the installation of the topsides, and the skylight opening allows the modular-integration bottom deck to be placed inside; an on-site closing gap is formed between the edge of the skylight opening and the outer edge of the modular-integration bottom deck perimeter; using the on-site closing gap connection structures to fill the on-site closing gap, so that the modular-integration bottom deck and the barrel topmost deck jointly form an integrated platform deck.

A drilling system configured to install a tap assembly into a ship skin is disclosed. The drilling system comprises a remotely-operated underwater vehicle and a drilling assembly configured to be operated by the remotely-operated underwater vehicle. The drilling assembly comprises a frame comprising an attachment element configured to hold the drilling assembly to a surface of the ship skin. The drilling assembly further comprises a drill actuation system comprising a linear actuator attached to the frame and a rotary actuator, wherein an actuation of the linear actuator is configured to move the rotary actuator relative to the frame to install the tap assembly into the ship skin by driving the tap assembly with the rotary actuator and the linear actuator.

A drilling system configured to install a tap assembly into a ship skin is disclosed. The drilling system comprises a remotely-operated underwater vehicle and a drilling assembly configured to be operated by the remotely-operated underwater vehicle. The drilling assembly comprises a frame comprising an attachment element configured to hold the drilling assembly to a surface of the ship skin. The drilling assembly further comprises a drill actuation system comprising a linear actuator attached to the frame and a rotary actuator, wherein an actuation of the linear actuator is configured to move the rotary actuator relative to the frame to install the tap assembly into the ship skin by driving the tap assembly with the rotary actuator and the linear actuator.

A floating territory is made of at least two floatable building components having the shape of a prism with a regular polygon base, such as a triangle, a square, a pentagon, a hexagon, etc. combined with sliding dovetails and dovetail grooves for sliding attachment to neighboring construction elements. The attachments allow the floatable building components to slide vertically relative to each other, thereby permitting the floating territory to follow the upward and downward movement of the waves. A method of converting floating ocean waste into structures, in particular, floating territories is also provided.

Marine vessels, including combatant (naval) vessels are produced inexpensively without requiring the use of as many skilled personnel as is conventional. The vessel produced has a high strength metal truss structure (both above and below the water line) capable of carrying major hull loads. A number of curved or doubly curved composite (e. g. GRP) panels produced by vacuum assisted resin transfer molding are fastened by bolts, marine adhesives, and/or rivets to the below water line portions of the truss structure where necessary to handle slamming loads and to reduce water resistance and wake. Substantially flat composite pultruded panels are fastened to the truss structure both above the water line, and below the water line where the resistance to slamming loads and reduction of water resistance and wake are not critical. Necessary equipment is installed within the open truss volume before the above-water-line panels are fully installed.

Marine vessels, including combatant (naval) vessels are produced inexpensively without requiring the use of as many skilled personnel as is conventional. The vessel produced has a high strength metal truss structure (both above and below the water line) capable of carrying major hull loads. A number of curved or doubly curved composite (e. g. GRP) panels produced by vacuum assisted resin transfer molding are fastened by bolts, marine adhesives, and/or rivets to the below water line portions of the truss structure where necessary to handle slamming loads and to reduce water resistance and wake. Substantially flat composite pultruded panels are fastened to the truss structure both above the water line, and below the water line where the resistance to slamming loads and reduction of water resistance and wake are not critical. Necessary equipment is installed within the open truss volume before the above-water-line panels are fully installed.

A catamaran lifting apparatus is disclosed for lifting objects in a marine environment. The apparatus includes first and second vessels that are spaced apart during use. A first frame spans between the vessels. A second frame spans between the vessels. The frames arc spaced apart and connected to the vessels in a configuration that spaces the vessels apart. 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. Each of the frames provides a space under the frame and in between the barges that enables a package to be lifted and/or a marine vessel to be positioned in between the barges and under the frames. In this fashion, an object that has been salvaged from the seabed can be placed upon the marine vessel that is positioned in between the barges and under the frames.