A portable communication device (100) automatically determines user hydration levels while the device is being transmitted. The portable communication device comprises a humidity sensor (120) located by a microphone and touch sensors (124) located on a push-to-talk (PTT) button (110). Data is gathered during PTT switch activation (112). No additional steps are required by the user. Alerts (140) are provided when predetermined dehydration thresholds are approached.

Thermal warming suits for a human occupant of a wet submersible vehicle are described. The thermal warming suits provide a dedicated envelope configured to encase at least a portion of the human occupant in a deformable suit that can be assembled around or donned, as well as be removed, by the occupant or others before or after entry and seating in or on the wet submersible vehicle, while underwater or surfaced. The suits provide a deformable, weight and space (i.e. volume) conscious, collapsible loose fitting perimeter around the occupant. The suits can be used to create a pneumatic barrier around at least a portion of the occupant by using a gas such as air provided from a gas reservoir to force water from the interior of the suit.

Thermal warming suits for a human occupant of a wet submersible vehicle are described. The thermal warming suits provide a dedicated envelope configured to encase at least a portion of the human occupant in a deformable suit that can be assembled around or donned, as well as be removed, by the occupant or others before or after entry and seating in or on the wet submersible vehicle, while underwater or surfaced. The suits provide a deformable, weight and space (i.e. volume) conscious, collapsible loose fitting perimeter around the occupant. The suits can be used to create a pneumatic barrier around at least a portion of the occupant by using a gas such as air provided from a gas reservoir to force water from the interior of the suit.

A communication device includes a mouthpiece intended to be worn in the mouth of a subject including an acoustic conduction plate intended to be bitten by the user; and a vibrating element configured to convert an audio input into an acoustic output, the vibrating element being coupled to the acoustic conduction plate so as to transmit said acoustic output to the plate.

Methods and systems to provide breathing air to underwater divers in response to the divers' respiration at pressures less than 25 psi above atmospheric pressure during inspiration while delivering no or minimal air during exhalation, by controlling the actions of a pump during the time course of breathing. Methods and systems that sense a diver's need for breathing air, determine inhalation demand or exhalation state, and control the operation of a pump which delivers breathing gas to the diver via a tube. An integrated system for the same which incorporates at least an energy source, pump, air tube, breathing aperture, sensor, and logic processor is disclosed.

Methods and systems to provide breathing air to underwater divers in response to the divers' respiration at pressures less than 25 psi above atmospheric pressure during inspiration while delivering no or minimal air during exhalation, by controlling the actions of a pump during the time course of breathing. Methods and systems that sense a diver's need for breathing air, determine inhalation demand or exhalation state, and control the operation of a pump which delivers breathing gas to the diver via a tube. An integrated system for the same which incorporates at least an energy source, pump, air tube, breathing aperture, sensor, and logic processor is disclosed.

A regulator for an underwater breathing apparatus includes a housing defining a breathing cavity, a mouthpiece in communication with the breathing cavity, a valve operable to permit air from an air inlet of the regulator into the breathing cavity, and a sensor operable to measure a composition of air within one or both of the breathing cavity and the mouthpiece.

A diving apparatus for a diver underwater includes a portable habitat in which a breathable environment is maintained underwater. The habitat has a collapsible envelope. The collapsible envelope takes shape through inflation to an expanded state underwater. The habitat has a modular payload which removably attaches to the envelope underwater. The habitat has a seat on which a diver can sit while the habitat is underwater. The modular payload has a breathable gas source to provide breathable gas for the diver to breathe in the habitat and a carbon dioxide scrubber which removes carbon dioxide from the environment when the habitat is underwater. The apparatus has an anchor mechanism attached to the habitat to maintain the habitat at a desired depth underwater. A method for a diver to dive underwater. A system for supporting a diver underwater. A diving apparatus having a propulsion unit. An apparatus for a user in outer space or on another planet.

A modular manifold assembly is configured to connect to a manifold block of an auto cascade system used to fill an individual fluid tank. The modular manifold assembly may include a main housing that contains one or more sequence valves and fluid conduits. The sequence valve(s) are configured to allow fluid to be sequentially drawn from a plurality of fluid storage cylinders.

The breathing port isolation apparatus includes a housing, valve, and actuator to enable a diver to isolate a breathing port of a snorkel or dive regulator using a single mouthpiece. The housing is configured to seat the valve and actuator and releasably engage a mouthpiece and dive regulator, which provides the diver with a continuous flow of air through the mouthpiece without having to transition between multiple regulators or breathing ports. The valve includes a piston and enables linear movement between the first and second port. The actuator enables the diver to depress a push-button and transition the actuator between depressed and extended positions, which correspond to the first and second breathing ports.