The invention relates to a propulsion device, in particular to an underwater propulsion device for divers (1) and swimmers comprising one or several drives (2) provided with electric motors (4) and means (3) for fixing the drives (2) to the legs or arms of the diver (1) or swimmer, wherein the electric motors (4) are provided with a sump cooling, with the electric motors (4) being arranged in waterproof housings (5) and each waterproof housing (5) only being partially filled with a cooling liquid. By arranging the drives (2) on the extremities of the diver (1) or swimmer, the flexibility and mobility are significantly increased; at the same time, the provision of a sump cooling system improves heat dissipation and thus increases the power density.

An underwater propulsion system is disclosed comprising a foot board with one or more battery-powered propulsion units. A throttle control system may be enabled in the foot board such that a movement of the user's foot controls the throttle. Flattened Lithium batteries allow thin lightweight construction of the foot board. Use of trolling motors as propulsion units provides thrust advantages over pre-existing underwater scooters.

An underwater propulsion system is disclosed comprising a foot board with one or more battery-powered propulsion units. A throttle control system may be enabled in the foot board such that a movement of the user's foot controls the throttle. Flattened Lithium batteries allow thin lightweight construction of the foot board. Use of trolling motors as propulsion units provides thrust advantages over pre-existing underwater scooters.

An underwater data center includes an electronic device; a housing member that houses the electronic device and that is configured to be disposed under water; and a heat exchanger that is provided at the housing member and that is configured to discharge, into the water, heat discharged from the electronic device, with a face of the heat exchanger that discharges the heat making contact with the water, an opening being formed in a bottom face of the housing member and placing an inside of the housing member in communication with the water.

A craft comprises a torque reaction engine, a beam, and a fin secured to the beam. The torque reaction engine causes the beam to oscillate. The fin, secured to the beam, translates through a surrounding thrust fluid as a result of oscillation of the beam. Translation of the fin through the surrounding thrust fluid produces thrust and/or lift on the fin, propelling the beam and torque reaction engine. The craft may further comprise a harness and be a diver propulsion vehicle.

A craft comprises a torque reaction engine, a beam, and a fin secured to the beam. The torque reaction engine causes the beam to oscillate. The fin, secured to the beam, translates through a surrounding thrust fluid as a result of oscillation of the beam. Translation of the fin through the surrounding thrust fluid produces thrust and/or lift on the fin, propelling the beam and torque reaction engine. The craft may further comprise a harness and be a diver propulsion vehicle.

The present invention provides a device useful for transporting and/or handling equipment in an underwater environment for performing work, the device comprising at least the following components: a floating hydraulic unit (1) comprising a first enclosure (1a), preferably with a cylindrical wall, containing an electrical pump unit (6), a battery (8) suitable for electrically powering the pump unit, and a fluid tank (7), preferably containing oil, said first enclosure (1a) being suitable for being made submersible by first ballast (16); at least one hydraulic tool (3) connected or suitable for being connected to at least one hydraulic coupling (11, 12) of said hydraulic unit via at least one flexible hose (30); at least one independent float (4), preferably having a cylindrical wall, connected or suitable for being connected to said hydraulic tool (3) via a sling (5) of adjustable length, said float (4) being suitable for being made submersible by second ballast (43); and a wired remote control (2) for switching on or stopping the pump unit (6), said wired remote control comprising a handle (22) fitted with an electrical contactor (2a) at a first end of an electric wire (20), the second end of the electric wire (20) being connected or suitable for being connected at least to said pump unit (6).

A submersible thruster includes a housing, a fixing component and a battery member. A containment cavity is formed inside the housing, the fixing component is positioned in the containment cavity; the battery member is fixedly and arranged in the containment cavity through the fixing component, the battery member is connected to the fixing component to form an integrated structure, and the fixing component is fixedly and arranged in the containment cavity and connected to the housing to form an integrated structure; in this way, the battery member can be fixedly installed in the housing, making the battery member and the housing an integrated structure, and the fixing component and the housing an integrated structure, the integrated setup makes the submersible thruster achieve the technical effect of simple internal structure thereof.

A submersible thruster includes a housing, a fixing component and a battery member. A containment cavity is formed inside the housing, the fixing component is positioned in the containment cavity; the battery member is fixedly and arranged in the containment cavity through the fixing component, the battery member is connected to the fixing component to form an integrated structure, and the fixing component is fixedly and arranged in the containment cavity and connected to the housing to form an integrated structure; in this way, the battery member can be fixedly installed in the housing, making the battery member and the housing an integrated structure, and the fixing component and the housing an integrated structure, the integrated setup makes the submersible thruster achieve the technical effect of simple internal structure thereof.

An underwater propulsion system is disclosed comprising a foot board with one or more battery-powered propulsion units. A throttle control system may be enabled in the foot board such that a movement of the user's foot controls the throttle. Flattened Lithium batteries allow thin lightweight construction of the foot board. Use of trolling motors as propulsion units provides thrust advantages over pre-existing underwater scooters.