An arrangement comprises: a plurality of diver propulsion vehicles (1), each configured for propelling at least one diver, wherein each diver propulsion vehicle (1) comprises a wireless communication interface (9, 10, 13) configured for providing a wireless communication, a support (30) for mechanically coupling the plurality of diver propulsion vehicles (1), wherein the support (30) is configured for mechanically coupling the plurality of diver propulsion vehicles (1) side-by-side or longitudinally via the support (30).

A diving watch assembly includes an internal airtight and waterproof space formed by a housing, an upper cover, a transparent plate and a lower cover, and an air pressure watch core, a water pressure watch core and a dial disc installed in the internal airtight and waterproof space. The air pressure watch core is adapted to drive a first pointer, and the water pressure watch core is adapted to drive the second pointer. The air pressure (air amount) scale and the water pressure (water amount) scale are respectively indicated by the first pointer and the second pointer on the same dial disc.

A method and apparatus for automatically controlling partial pressure of oxygen in the breathing loop of a rebreather diving system. A diver may adjustably select a control parameter to maintain partial pressure of oxygen at a setpoint that varies with ambient pressure and is within a range between a maximum safe partial pressure of oxygen at depth and a minimum safe partial pressure of oxygen for the purpose of biasing the performance of the rebreather either towards minimizing gas venting from the rebreather breathing loop or minimizing decompression time. A method and apparatus for managing and monitoring the use of dive resources in comparison with a target dive time specified by the diver, calculating and indicating remaining dive time based on dive resource values and calculating and indicating dive resource values required to meet preselected dive resource end values and dive requirements.

Dive computers in accordance with embodiments of the invention are disclosed. One embodiment includes a mobile phone handset, including a microprocessor, a microphone connected to the microprocessor, a speaker connected to the microprocessor, a telephone transceiver connected to the microprocessor, memory, a display, and an external connector for communicating with external devices wherein the memory contains a software application, and a waterproof housing including a pressure transducer, where the mobile phone handset is located within the waterproof housing and connected to the pressure transducer via the external connector, and wherein the software application configures the mobile phone handset to create a dive log stored in memory, wherein the dive log comprises recorded information including depth of submersion information recorded from the pressure transducer and display the recorded information during the dive.

Dive computers incorporating a variety of features are disclosed. One embodiment of the invention includes a dive computer including a microprocessor, memory configured to store a software application, a pressure transducer configured to determine depth information, and a communications device configured to communicate with external devices, wherein the software application configures the microprocessor to create a dive log stored in memory, wherein the dive log includes recorded information including depth of submersion information recorded from the pressure transducer, and transmit the dive log using the communications device.

A dive computer system that utilizes a direct skin temperature measurement is provided. The dive computer system includes a measurement device that includes a temperature sensor and is attached to a strap. The strap is placed around a diver's chest and configured to measure the diver's skin temperature. The skin temperature is wirelessly transmitted to a dive computer that utilizes a dive algorithm to determine compartment inert gas saturation and desaturation. The dive algorithm determines an updated skin perfusion factor that is in turn utilized to determine an updated half time for the skin compartment for inert gas desaturation and a pressure tolerance for the skin compartment for inert gas saturation.

A method and device for displaying computer content associated with a propulsion system, include: a standalone computer element (MO), the computer element including a display screen (4) in particular for displaying the computer content; a standalone propulsion element (PO) for moving an operator; an element for securing the computer element to the propulsion element; and an element for modifying the display of the computer content according to the movement of the operator, given that the movement of the operator takes place in a sub-aquatic environment.

A wrist-worn electromagnetic pulse generating wearable device for repelling great white sharks, tiger sharks, and bull sharks. i.e., the lethal shark breeds. The device includes an artificial intelligence/machine learning component (AI/ML) trained on a dataset including characteristics of the lethal shark breeds. A hydroactive sensor activates the device upon immersion in marine or fresh water. A signal generating component, responsive to AI/ML component, generates an ELF signal that radiates out to a 4 m area surrounding the user to repel shark attacks. Wave pulse characteristics, such as frequency, waveshape, and magnitude are determined by the AI/ML algorithm based on the detected shark breed. Antenna design based on fractal geometry (e.g., the T-square fractal, or the Sierpinski Triangle) generates an ideal isotropic radiation pattern. The wrist-mounted form factor of the inventive device offers improved performance over prior art devices.

A portable diver device (100) for managing diving activities for a diver, wherein the portable diver device (100) comprises at least one data storage unit (102) storing identification data being indicative of an identity of the diver and optionally storing diving related data related to the diver, and a wireless data communications interface (104) configured for wirelessly communicating at least one of the group consisting of the identification data and the diving related data with a diving activities management apparatus (120, 130, 140), when the portable diver device (100) is in sufficient spatial vicinity of the diving activities management apparatus (120, 130, 140).

An apparatus for protecting and providing user access to a touch sensitive device underwater, comprising a waterproof casing comprising an inner cavity configured to receive the touch sensitive device, the casing comprising: a first area of the casing for providing user access to the touch sensitive device; a transparent first membrane arranged to cover at least part of the first area of the casing, the inner cavity configured to receive the touch sensitive device so that user interface of the touch sensitive device being arranged adjacent to the membrane of the first area; a pressurized non-conductive fluid arranged to the inner cavity to provide a gap between the user interface of the touch sensitive device and the membrane; a pressure control membrane arranged to cover at least part of a second area of the casing; and a pressure control element operationally connected to the pressure control membrane, configured to flexibly bend the pressure control membrane to change pressure of the pressurized non-conductive fluid.