The present invention comprises a snorkel, comprising a breathing hose, the breathing hose having a mouthpiece at one end and connected to a buoyant rigid body at the other end, the rigid body comprising an internal cavity, with the breathing hose connected to the internal cavity; a first opening into the internal cavity disposed at a top end of the rigid body, the first opening having a first cover with a diameter greater than the diameter of the opening, and the first cover extending over the first opening; and a weighted ring secured to a bottom end of the rigid body, the weighted ring surrounding the end of the breathing hose connected to the rigid body, wherein the breathing tube and the first opening define an airway permitting a user to breathe through the snorkel.

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 (26), pump (28), air tube (30), breathing aperture (10), sensor (20), and logic processor (24) 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 (26), pump (28), air tube (30), breathing aperture (10), sensor (20), and logic processor (24) is disclosed.

The mask for surface snorkeling comprises a rigid frame (2), a transparent visor (3), a soft face mask (4) applicable in an airtight way to the face of the user and having a membrane (7) which delimits an upper viewing chamber (8) being shaped to contain the eyes of the user and a lower breathing chamber (9) being shaped to contain the nose and mouth of the user, and a breathing circuit (5) connected to the lower chamber (9), a ventilation circuit of the upper chamber (8) independent and separated from the breathing circuit (5) also being provided.

A paddlecraft with a recess in its deck for a hookah diving compressor is disclosed where a user can paddle to a dive site and dive there without removing the compressor from the recess. An interchangeable insert for the recess supports different shapes and sizes of compressors. For a water-cooled compressor, the recess admits water from beneath the paddlecraft, or part of the compressor protrudes through the recess into the water beneath. A lid for the recess with an attachable tube feeds air to the compressor. An airline connection point is integrated into the paddlecraft, readily allowing connection and removal of an airline, or two or more airlines via an adaptor. The paddlecraft can also house an air reserve tank, allowing the user to dive without removing it. If the paddlecraft is an SUP, part of the SUP deck preferably functions as an air reserve tank.

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.