A self-contained surface supplied air system preferably provided with backpack-wearable capability and automated setup functions for ease of use that is capable of recording valuable recreational and scientific data in an unobtrusive manner. The flotation tube process for the system can be automated to reduce setup time and electronically regulated to increase reliability and safety. The system allows recreational divers or their inherent equipment to be capable of recording valuable and reputable data in a manner that does not involve extra effort by the user. The disclosed system can use a miniature pH sensor design with automatic calibration for integration into the data recording device. In one embodiment, the novel hookah diving system comprises a portable body enclosing all necessary equipment and featuring automatic flotation tube inflation and deflation. An integrated data recording device collects physical data at points along the diver's tether preferably from the surface all the way to the depth of the diver.

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.

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 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 snorkel mouthpiece assembly, including a main body, a mouthpiece, a connecting component and an accessory, is provided. The mouthpiece is connected to the main body. The connecting component includes a connecting portion and a fixing portion opposite to the connecting portion. The connecting portion is detachably connected to the main body, and the accessory is connected to the fixing portion. In this way, the snorkel mouthpiece assembly could be equipped with a variety of accessories during water or diving activities.

The present invention provides an underwater breathing device. The device comprises a canister having a pump installed therein, wherein air outside of the canister communicates with the interior of the canister via the pump; a mouthpiece; and an elongate tube interconnecting the interior of the canister and the mouthpiece. Methods of making and using the device are also disclosed.

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.

Embodiments described herein relate to a self-contained breathing apparatus, and more particularly, to a self-contained breathing apparatus that uses extraction and exchange of oxygen and carbon dioxide between a perfluorocarbon and water in which the apparatus is immersed. Embodiments include a water-to-perfluorocarbon exchange chamber; an air-to-perfluorocarbon exchange chamber; and a circulation pump, where the circulation pump is configured to circulate perfluorocarbon between the water-to-perfluorocarbon exchange chamber and the air-to-perfluorocarbon exchange chamber, where the perfluorocarbon becomes oxygen rich in response to passing through the water-to-perfluorocarbon exchange chamber, and where the perfluorocarbon becomes oxygen depleted in response to passing through the air-to-perfluorocarbon exchange chamber.

There is disclosed a method and system for determining the partial pressure of at least one gas in a mixture of gasses contained in a pressure vessel, in particular a pressure vessel in the form of a life support pressure chamber/decompression chamber, or a diving gas storage cylinder. The method comprises the steps of: coupling a gas analysis sensor (14) to a pressure vessel (10); directing a portion of the mixture of gasses in the pressure vessel to the sensor for analysis; reducing the pressure of the portion of the mixture which is to be analyzed by the sensor to a level which is below the pressure in the vessel but above local atmospheric pressure; operating the sensor to measure the partial pressure of the at least one gas at the reduced pressure level; and using the partial pressure of the at least one gas, measured at the reduced pressure level, to determine the actual partial pressure of said gas in the mixture contained in the vessel.