Proposed are a submarine power supply system and power supply method using a seawater battery, the system having a chargeable/dischargeable battery that is arranged on the outside of a pressure hull, so as to use, as a cathode, sodium ions dissolved in seawater, and thus produce electric power, which is then used as electric power required for operating a submarine.

A method for detecting and locating a carbon dioxide leak in a submarine environment includes operating autonomous underwater vehicles (AUVs) in the submarine environment, where the operating includes obtaining, with each AUV of the AUVs, measurements of an attribute indicative of carbon dioxide, communicating, while operating the AUVs, the measurements from the each AUV to other AUVs of the AUVs, mapping, while operating the autonomous AUVs, carbon dioxide concentration in the submarine environment, and guiding the AUVs toward a highest concentration of the carbon dioxide concentration based on the mapping.

A method for detecting and locating a carbon dioxide leak in a submarine environment includes operating autonomous underwater vehicles (AUVs) in the submarine environment, where the operating includes obtaining, with each AUV of the AUVs, measurements of an attribute indicative of carbon dioxide, communicating, while operating the AUVs, the measurements from the each AUV to other AUVs of the AUVs, mapping, while operating the autonomous AUVs, carbon dioxide concentration in the submarine environment, and guiding the AUVs toward a highest concentration of the carbon dioxide concentration based on the mapping.

A robotic eel may comprise a plurality of torque reaction engines, an inertial mass, and a fin. Each of the plurality of torque reaction engines oscillates an inertial mass about an axis, producing a torque reaction on and oscillation of an external shaft. Oscillation of the external shaft bends a beam of the robotic eel. Bending the beam of the robotic eel produces at least one of a traveling or a standing wave in the beam. The traveling wave may be communicated to a second torque reaction of the plurality of torque reaction engines and to the fin, producing thrust.

A robotic eel may comprise a plurality of torque reaction engines, an inertial mass, and a fin. Each of the plurality of torque reaction engines oscillates an inertial mass about an axis, producing a torque reaction on and oscillation of an external shaft. Oscillation of the external shaft bends a beam of the robotic eel. Bending the beam of the robotic eel produces at least one of a traveling or a standing wave in the beam. The traveling wave may be communicated to a second torque reaction of the plurality of torque reaction engines and to the fin, producing thrust.

A watercraft (101), such as a submersible or submarine, is provided which includes a hull; a propulsion system (121) for propelling the hull through water; and a power plant which powers the propulsion system, the power plant including a heat engine (103) and a thermal energy source. The thermal energy source includes at least one material selected from the group consisting of nuclear isomers and radioisotopes.

A watercraft (101), such as a submersible or submarine, is provided which includes a hull; a propulsion system (121) for propelling the hull through water; and a power plant which powers the propulsion system, the power plant including a heat engine (103) and a thermal energy source. The thermal energy source includes at least one material selected from the group consisting of nuclear isomers and radioisotopes.

A sea scooter has a main housing, a left arm pivotably attached to the left side of the main housing, a right arm pivotably attached to the right side of the main housing, a left barrel secured to the left arm, and a right barrel secured to the right arm. Each barrel has a fan and a motor for propelling the sea scooter through water. The left and right arms are locked by the first and second locking assemblies into a folded configuration against the left and right sides of the main housing when the sea scooter is not in use, and the left and right arms are pivoted away from the left and right sides of the main housing in a use configuration when the sea scooter is in use in the water. The motor is sand-proof and water-proof.

A sea scooter has a main housing, a left arm pivotably attached to the left side of the main housing, a right arm pivotably attached to the right side of the main housing, a left barrel secured to the left arm, and a right barrel secured to the right arm. Each barrel has a fan and a motor for propelling the sea scooter through water. The left and right arms are locked by the first and second locking assemblies into a folded configuration against the left and right sides of the main housing when the sea scooter is not in use, and the left and right arms are pivoted away from the left and right sides of the main housing in a use configuration when the sea scooter is in use in the water. The motor is sand-proof and water-proof.

An unmanned undersea vehicle including a magnetic coupler drive. The magnetic coupler drive is incorporated into a hull section, such as a tail section of the unmanned undersea vehicle. The magnetic coupler drive includes a motor shaft magnet, a titanium housing disposed about the motor shaft magnet, and a propeller shaft magnet magnetically coupled to the motor shaft magnet, but physically separated from the propeller shaft magnet by the titanium housing.