A mooring system comprising: a ballast platform; and a chain comprising a plurality of links that are pivotally connected to each other via parallel pivot pins such that the chain is configured to not rotate about a vertical axis that is orthogonal to axes of rotation of the pivot pins, wherein the chain has proximal and distal ends, and wherein the proximal end is attached to a top of the ballast platform and the distal end is configured to be attached to a buoyant object.

A mooring system comprising: a ballast platform; and a chain comprising a plurality of links that are pivotally connected to each other via parallel pivot pins such that the chain is configured to not rotate about a vertical axis that is orthogonal to axes of rotation of the pivot pins, wherein the chain has proximal and distal ends, and wherein the proximal end is attached to a top of the ballast platform and the distal end is configured to be attached to a buoyant object.

A deep-sea anchoring device for gravity and anchor composite with a decelerating wing includes an anchoring base, a decelerating wing and an anchor body. The anchoring base provides an anchoring force by its own gravity, heavy pressure and friction with a sea floor. The decelerating wing includes a main decelerating wing, and a secondary decelerating wing that increases the cross-sectional area for diversion, so that a resistance is produced by water flowing through the main and secondary decelerating wings to reduce the falling speed of the anchoring base to a safe range, and prevent the anchoring base from being damaged by its collision with the sea floor. The anchor body is pivoted to the bottom of the anchoring base and anchored by being shoveled into a sea floor mainly consisting of gravels or deposited soil or abutted against rough rocks of a sea floor mainly consisting of rocks.

A method that includes introducing fluid into a lift bag system to increase buoyancy of the lift bag system within a body of water to cause testing of an anchor and/or removal of the anchor from a substrate within a body of water. The lift bag system includes a lift bag body that includes a lift bag top end and one or more sidewalls that define a lift bag cavity configured to hold a volume of fluid. Introducing fluid into the lift bag system increases buoyancy of the lift bag body within the body of water to cause testing of the anchor and/or removal of the anchor from the substrate within the body of water. The lift bag system also includes a compression tube that extends between a compression tube top end and a compression tube bottom end, an attachment point, and a plurality of bridles.

An underwater vehicle may include a buoyancy control system configured to use a dual-internal-reservoir configuration to enhance efficiency of changing buoyancy of the underwater vehicle. The buoyancy control system may utilize an incompressible fluid (e.g., oil or water) that is transferred between a first internal reservoir and an external chamber to affect buoyancy of the underwater vehicle. In exemplary implementations, a compressible fluid (e.g., air) may be used to inflate or deflate a second internal reservoir. The second internal reservoir may be disposed within the buoyancy control system so that it can act on the first internal reservoir by applying a compressive force or a tensive force on the first internal reservoir, depending on the pressure differences between the two reservoirs.

An off-shore wind turbine system is assembled using a platform or jack-up vessel, and a first base anchored to the seafloor at a blade assembly off-shore location. A buoyant tower is attached to the first base. A crane provided on the platform or jack-up vessel is used to lift blades and blades, which are then coupled to a turbine held in a nacelle provided at the top of the buoyant tower. The buoyant tower, the nacelle, and the blades are detached from the first base. The buoyant tower, the nacelle, and the blades are towed to a wind farm and connected to a second base provided in the wind farm. The buoyant tower, the nacelle, and the blades are further stabilized using mooring lines spanning between the buoyant towers and other bases provided in the wind farm. The first base and/or the second base include anti-rotation features.

An underwater vehicle may include a buoyancy control system configured to use a dual-internal-reservoir configuration to enhance efficiency of changing buoyancy of the underwater vehicle. The buoyancy control system may utilize an incompressible fluid (e.g., oil or water) that is transferred between a first internal reservoir and an external chamber to affect buoyancy of the underwater vehicle. In exemplary implementations, a compressible fluid (e.g., air) may be used to inflate or deflate a second internal reservoir. The second internal reservoir may be disposed within the buoyancy control system so that it can act on the first internal reservoir by applying a compressive force or a tensive force on the first internal reservoir, depending on the pressure differences between the two reservoirs.