The invention provides an object (10) that during use is at least partly submerged in water, the object (10) further comprising an anti-bio fouling system (200) comprising an UV emitting element (210), wherein the UV emitting element (210) comprises one or more light sources (220) and is configured to irradiate with UV radiation (221) during an irradiation stage one or more of (i) a part (111) of an external surface (11) of said object (10) and (ii) water adjacent to said part (111) of said external surface (11), wherein the object (10) is selected from the group consisting of a vessel (1) and an infrastructural object (15), wherein the object (10) further comprises a water switch (400), wherein the anti-bio fouling system (200) is configured to provide said UV radiation (221) to said part (111) in dependence of the water switch (400) being in physical contact with the water.

An ultrasonic system for treating a submerged surface of a target structure, the system including: an ultrasonic generator for generating electrical energy to drive first and second ultrasonic transducers, the electrical energy including at least two different frequencies including a first and second operation frequency; first ultrasonic transducers configured to be mounted as a first array to the target structure, and connectable to the ultrasonic generator and operable to generate a first ultrasound signal from the first operation frequency; and second ultrasonic transducers configured to be mounted as a second array to the target structure, and connectable to the ultrasonic generator and operable to generate a second ultrasound signal from the second operation frequency, wherein the first and second ultrasonic transducers are spaceable from one another to produce guided ultrasonic waveforms through the target structure including heterodyned frequencies from the first ultrasound signal and the second ultrasound signal.

An underwater cleaning robot system includes an underwater robot and an overwater control platform, the underwater robot includes a cleaning robot and a driving robot, and the cleaning robot is carried on the driving robot; and the cleaning robot includes a motor and a pump, the pump is connected to the motor and driven by the motor to generate high-pressure fluid, and the overwater control platform communicates with the cleaning robot and the driving robot to control the cleaning robot and the driving robot. The overwater control platform and the underwater robot are connected by a thin zero-buoyancy cable, and the working range is over 1000 meters.

A self-cleaning and anti-adhesion apparatus for marine instruments includes an installation frame. A first end of the installation frame is fixed with an installation base, and a second end of the installation frame is movable with a screw rod. The upper end of the installation base is movable with a first rotation base. A wire netting ball used for holding a sensor is installed above the first rotation base. The wire netting ball is fixedly connected with the installation base. The top end of the screw rod is fixedly connected with a first end of the flexible connector, and a second end of the flexible connector is fixedly connected with a floating bladder. The screw rod is screwed with an inner wheel of an internal meshing ratchet mechanism, and an outer wheel of the internal meshing ratchet mechanism is fixed inside the mounting ring.

An electric current supply system (20) is designed to be at least partially submerged in an electrically conductive liquid during operation thereof, and having at least one electrically conductive component (21, 22, 23, 24) enveloped in liquid-tight material (40). The component (21, 22, 23, 24) has a sacrificial material that is capable of reacting electrochemically with the liquid. Further, the component (21, 22, 23, 24) has at least one gas trap portion (50) at which the sacrificial material occupies a space in the liquid-tight material (40) that is thereby defined with a gas trapping shape. If, in case of damage to the system (20) in an actual submerged state thereof, the component (21, 22, 23, 24) gets exposed to the liquid, it is achieved that an electrochemical reaction occurring at the exposed area of the component (21, 22, 23, 24) and an outflow of electric current to the liquid are stopped.

In the context of anti-biofouling of marine objects, a light emitting unit is configured to be applied to a surface area of a marine object and comprises at least one light source (12, 13) configured to emit anti-fouling light, and two electrically conductive plates (14, 15), wherein the at least one light source (12, 13) is at the one side electrically connected to one of the plates (14, 15) and at the other side to an electric energy distribution arrangement of the light emitting unit. The plates (14, 15) are arranged to constitute respective capacitors (21, 22) with an electrically conductive surface area of, or over, the marine object, said capacitors (21, 22) being connected in series through the electrically conductive surface area once the light emitting unit is actually applied to a surface area of a marine object.

An ultrasonic system for treating a submerged surface of a target structure, the system including: an ultrasonic generator for generating electrical energy to drive first and second ultrasonic transducers, the electrical energy including at least two different frequencies including a first and second operation frequency; first ultrasonic transducers configured to be mounted as a first array to the target structure, and connectable to the ultrasonic generator and operable to generate a first ultrasound signal from the first operation frequency; and second ultrasonic transducers configured to be mounted as a second array to the target structure, and connectable to the ultrasonic generator and operable to generate a second ultrasound signal from the second operation frequency, wherein the first and second ultrasonic transducers are spaceable from one another to produce guided ultrasonic waveforms through the target structure including heterodyned frequencies from the first ultrasound signal and the second ultrasound signal.

An ultrasonic system for treating a submerged surface of a target structure, the system including: an ultrasonic generator for generating electrical energy to drive first and second ultrasonic transducers, the electrical energy including at least two different frequencies including a first and second operation frequency; first ultrasonic transducers configured to be mounted as a first array to the target structure, and connectable to the ultrasonic generator and operable to generate a first ultrasound signal from the first operation frequency; and second ultrasonic transducers configured to be mounted as a second array to the target structure, and connectable to the ultrasonic generator and operable to generate a second ultrasound signal from the second operation frequency, wherein the first and second ultrasonic transducers are spaceable from one another to produce guided ultrasonic waveforms through the target structure including heterodyned frequencies from the first ultrasound signal and the second ultrasound signal.

A cleaning device that passively self-adjusts to improve biofoul removal across curved, non-uniform, or irregular underwater surfaces. The cleaning device includes a motor, one or more shafts coupled to the motor and coupled to one another via at least one universal joint, and a cleaning mechanism for removing biofoul from the target surface. The cleaning device includes an alignment mechanism that restricts the cleaning mechanism's movement to improve biofoul removal. The alignment mechanism can include bearings, spring components, dampening material, adhesion components, floatation objects, or a combination thereof.

A cleaning device that passively self-adjusts to improve biofoul removal across curved, non-uniform, or irregular underwater surfaces. The cleaning device includes a motor, one or more shafts coupled to the motor and coupled to one another via at least one universal joint, and a cleaning mechanism for removing biofoul from the target surface. The cleaning device includes an alignment mechanism that restricts the cleaning mechanism's movement to improve biofoul removal. The alignment mechanism can include bearings, spring components, dampening material, adhesion components, floatation objects, or a combination thereof.