A survival helmet device for use in combination with a survival suit includes a helmet, inhale and exhale control valves, and at least one inflatable air cavity pocket secured to the survival suit for selectively controlling the air supply and buoyancy of the survival helmet device and the survival suit.

Diving gear includes an air pump having a rigid housing with an interior space and an opening closed by a bag-like flexible part to form a variable pump volume delimited by the housing and the flexible part. The air pump is configured so that, if surrounding water causes positive pressure, the flexible part is pressed into the interior space, thus reducing the pump volume, and, at least in sections, lies against a housing inner wall in an interior space contact portion. A diver can pull the flexible part out of the interior space counter to the positive pressure, thus increasing pump volume. An air duct is configured so that, during the suction, air flows from an interior space end region toward a start of the interior space at least into a maximum height region, preferably into the interior space start region, and into the interior space.

A diving device includes an air pump with a rigid housing including an interior and an opening closed by a sack-shaped flexible part to form a variable pump volume delimited by the housing and the flexible part. The air pump is designed such that if surrounding water causes overpressure, the flexible part is pressed into the interior, thereby reducing the pump volume, and rests against an inner wall of the housing at least partly in a contact section of the interior. The flexible part can be pulled out of the interior against the overpressure by the muscle force of a diver, thereby increasing the pump volume. The air supply line can be releasably secured to a support device, in particular a waist belt of the support device, centrally behind the back of the diver, and a quick ejection device is provided for releasably securing the air supply line.

A wearable electronic device for detecting diver respiration comprises a transducer element and a processing element. The transducer element is configured to receive sonar waves and communicate a corresponding receiver electronic signal. The processing element is configured or programmed to receive the receiver electronic signal, identify that a breath of the diver has occurred from the receive electronic signal, determine a respiration rate of the diver based on a plurality of breaths, and present an indication of the respiration rate to the diver.

A wearable electronic device for detecting diver respiration comprises a transducer element and a processing element. The transducer element is configured to receive sonar waves and communicate a corresponding receiver electronic signal. The processing element is configured or programmed to receive the receiver electronic signal, identify that a breath of the diver has occurred from the receive electronic signal, determine a respiration rate of the diver based on a plurality of breaths, and present an indication of the respiration rate to the diver.

A semi-closed rebreather that uses a normal open type of solenoid valve to control the flow of replenishment gas supplied to the rebreather circuit by at least one replenishment gas cylinder. In the absence of energy, the rebreather system takes the open condition, thereby allowing a replenishment gas flow with a maximum flow rate predetermined during the initial design or adjustment step.

A wearable electronic device for detecting diver respiration comprises a transducer element and a processing element. The transducer element is configured to receive sonar waves and communicate a corresponding receiver electronic signal. The processing element is configured or programmed to receive the receiver electronic signal, identify that a breath of the diver has occurred from the receive electronic signal, determine a respiration rate of the diver based on a plurality of breaths, and present an indication of the respiration rate to the diver.

A wearable electronic device for detecting diver respiration comprises a transducer element and a processing element. The transducer element is configured to receive sonar waves and communicate a corresponding receiver electronic signal. The processing element is configured or programmed to receive the receiver electronic signal, identify that a breath of the diver has occurred from the receive electronic signal, determine a respiration rate of the diver based on a plurality of breaths, and present an indication of the respiration rate to the diver.

An improved hydrodynamic sports snorkel for use in swim training, exercise and other recreational activities, which facilitates efficient swimming by eliminating the need for a swimmer to turn their head to the side for breathing. The sport snorkel device provides a novel design that significantly reduces drag and resistance, including by directing breathing tubes down the sides of the chin and under the jaw line toward the neck, around the neck and rejoining and going to the surface at the back of the neck behind the swimmer's head. This novel design with tubes running under the jawline and behind the head significantly reduces the portion of snorkel tubing directly in the water flow stream and thus reduces drag and resistance. The sport snorkel device also allows the swimmer to hold the snorkel solely by the mouthpiece without the need to fixedly attach the device to the swimmer's head or goggles.

An augmentation amplifier is provided for aspirating gas flow from a surrounding medium. The amplifier connects at an inlet to a pressurized gas source and at an outlet to a gas receiver. Ambient gas from the medium supplements source provided compressed gas. The amplifier includes a Venturi conduit including a throat, an external cavity and a diffusion chamber. The conduit receives and flows pressurized gas from the inlet to the throat. The cavity receives ambient gas from the medium. The chamber expands and accelerates the pressurized gas from the throat to entrain the ambient gas via aspiration. The accelerated and ambient gases combine into an exhaust gas to the outlet.