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.

A detecting device of a regulator assembly includes a chamber, a warning unit, and a switch member. The warning unit is movably installed in the chamber. When the switch member is in a first state, the switch member blocks a predetermined inlet of the chamber. When the switch member changes from the first state to a second state, the switch member does not block the predetermined inlet of the chamber. The present disclosure further provides a method for operating a regulator assembly.

A topside buoy system is disclosed for relaying a status of a diver between a monitoring station and a diver's wearable device and scuba tank pod. The communication may be carried by sonar signals underwater and may be transmitted by short-range communication methods through air. An application on the command station may display diver status information and may receive and transmit messages between the command station and the wearable device of the diver via the topside buoy. The diver location data may be determined relative to the topside buoy by determining a time delay of the sonar signal between the wearable device and the topside buoy, by a plurality of transducers configured to detect an angle from which the sonar signal originated, and a depth of the diver included in the sonar signal.

In variants, a wearable stimulant alert system for a diver can include an air tank, first stage regulator, air hose, second stage regulator, a mouthpiece, a stimulant mechanism, and/or an optional controller. The stimulant mechanism can include a stimulant, stimulant container, and a stimulant release mechanism. The wearable stimulant alert system can function to alert a diver when a stimulant condition (e.g., when the air tank pressure falls below a threshold value) is met.

A topside buoy system is disclosed for relaying a status of a diver between a monitoring station and a diver's wearable device and scuba tank pod. The communication may be carried by sonar signals underwater and may be transmitted by short-range communication methods through air. An application on the command station may display diver status information and may receive and transmit messages between the command station and the wearable device of the diver via the topside buoy. The diver location data may be determined relative to the topside buoy by determining a time delay of the sonar signal between the wearable device and the topside buoy, by a plurality of transducers configured to detect an angle from which the sonar signal originated, and a depth of the diver included in the sonar signal.

A head-mounted device includes goggles and an image projection module. The image projection module includes a housing fixed on the goggles, an optical element, a projector fixed on the housing and a reflective element disposed within the housing. The housing defines a channel and first and second channel openings. The projector is configured to project an image light beam toward the optical element located in the channel through first and second optical surfaces of the optical element sequentially. The reflective element is configured to receive the image light beam and reflect the received image light beam to generate a reflected light beam directed to the second optical surface. The optical element is configured to refract the reflected light beam toward a lens of the goggles to generate a refracted light beam leaving the channel from the first channel opening and passing through the lens for forming an image.