A sonar system and method enable performing angled-looking sonar (ALS) by emitting sonar waves in a forward and downward direction from sonar transducers located at an underwater vessel. The sonar waves may be received by sonar transducers located al the underwater vessel. Additionally, a variable geometry sonar system and method enable performing side scan sonar (SSS) and ALS by moving al least one sonar transducer to perform both SSS and ALS. The variable geometry sonar system may be used with an underwater vessel to perform mine countermeasure (MCM) missions by using ALS for a homing phase on a target.

A pressure-resistant hull for a submersible, includes unit hulls, reinforcing ribs, connecting channels, and closure heads. A plurality of unit hulls are provided, and are sequentially strung together spiralling upward or spiralling downward, the closure heads being arranged on the unit hulls at the first position and the last position respectively, an observation window being provided on each unit hull respectively, adjacent two unit hulls in a horizontal direction being respectively connected by means of a reinforcing rib, and at least two connecting channels being provided between adjacent two rings of the unit hulls in the vertical direction. The design method includes using a spiral joining structure to facilitate organic adjustment of the number of unit hulls, thus having better utilization of space and aiding to greatly expand the space. The sensitivity of the limit load to defects is low, increasing axial rigidity, improving the overall pressure-resistive ability.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for estimating wave properties of a body of water. A computer-implemented system obtains measurement data for a duration of time from an inertial measurement unit (IMU) onboard an underwater device, generates model input data based on at least the measurement data obtained at the plurality of time points, and processes the model input data to generate model output data indicating one or more wave properties using a machine-learning model. The system further determines, based on at least the one or more wave properties, whether the device is safe to be deployed.

A buoyancy adjusting device for an underwater device is described the device comprising: a tube having first and second ends; a resilient mechanism located at the first end of the tube and extending towards the second end of the tube; an opening near the second end of the tube; a catch at the second end of the tube; 5 and at least one block insertable into from the first end of the tube to adjust the buoyancy.

An acoustic-electric remote control release hook used on water and underwater includes a first shell and a cylindrical framework. The cylindrical framework is fixedly connected with the first shell in a detachable mode; the first underwater transducer is remotely matched with a second water transducer which extends to the underwater through a cable, and the second water transducer is connected with a control switch through a cable. An acoustic command receiving module is arranged inside the first shell, and a power supply end of the acoustic command receiving module is connected with the power supply. A signal input end of the acoustic command receiving module is connected with the first underwater transducer through a cable and a watertight connector assembly, and a signal output end of the acoustic command receiving module is connected with the driver of the direct-current motor.

A water surface system for mitigation of tropical storms or hurricanes/typhoons/cyclones, the water surface system comprising one or more floating objects capable of minimizing water temperature increase due to sun irradiation and water evaporation and one or more boom-like structures capable of containing the floating objects in a designated area. For effective mitigation, the designated areas are the origins and paths historically most often occurred of storms/hurricanes/typhoons/cyclones.

The present disclosure is directed to delivering nodes to an ocean bottom. A system can include a tether management system (TMS) towed by a vessel that moves on the surface of the ocean in a first direction. An underwater vehicle (UV) can be connected to the TMS and can move in a second direction that is different from the first direction. A thruster can be coupled to the TMS can cause the TMS to move in a third direction that is different from the first direction. A control unit can control the thruster to move the TMS in the third direction based on a cross-line location policy, and cause the UV to deploy nodes to target locations on the ocean bottom.

A system to perform marine surveying may include a pair of identical design autonomous marine survey vehicles configured for coordinated operations. The vehicles may navigate and transit from a launch location to a geographically distant designated survey location, continuously survey and transit to a designated recovery location. A pair of vehicles may operate interchangeably at the sea surface, semi-submerged and underwater. Each may generate energy when operating at the surface and store energy in a rechargeable battery to power vehicle operation. The payload may include a sensor system to acquire seabed sensor data. A data storage system may store the sensor data. An on-board payload quality control system may analyze data validity. Positioning when the vehicle is collecting seabed sensor data may be determined with high precision, to provide survey data of high precision.

The present disclosure relates to methods, techniques, and systems for underwater vehicles, in particular buoyancy driven vehicles such as vertical profiling floats. An example vertical profiling float vehicle is constructed from two independent substantially cylindrical pressure housings that each have a concave end. The housings are coupled to one another at their concave ends, such that the concavities face one another and form a chamber. The chamber is open to the environment and houses an external displacement bladder, such that the bladder is located at or about the midplane of the vehicle. The vehicle may also include a fluid return system that is operable to precisely control the return of fluid from the displacement bladder to an internal reservoir. The vehicle in some embodiments may also include a fixed-displacement pump configured to pump fluid from the internal reservoir to the displacement bladder.

The technology relates to an apparatus, methods and applications which take readings and samples in contaminated bodies of water at desired locations and depths. The apparatus is a remote control boat or similar apparatus that can travel on the surface, partially submersed or fully submersed. Onboard remote control instruments read pH, temperature, conductivity, salinity, turbidity, total dissolved solids, dissolved oxygen, oxidation-reduction, ammonia, nitrate, phosphate as well as algae and chlorophyll levels. It can also perform sludge blanket mapping and take water or sludge samples at different depths of the water column or at the bottom of the body of water. The data obtained permits to evaluate the health of a contaminated body of water to develop appropriate bioremediation procedures and monitor progress. The apparatus can also deliver the necessary bioremediation products. The danger for humans to navigate on contaminated waters is avoided with the remote control apparatus.