A diving accessory is disclosed. The invention is comprised of a compact, lightweight fishing spear having two parts: a hollow main tube and a barbed spear. Said spear can be stowed inside the tube and the entire apparatus clipped to a diver when not in use. The invention can also be used as a poking stick (for self defense against large sea creatures), a tickling stick (for prodding prey out of small spaces), and as a camera monopole (by using the onboard shoe mount). An objective of the invention is to provide a compact, spearfishing device with multiple functions to enhance the diving experience.

A diving accessory is disclosed. The invention is comprised of a compact, lightweight fishing spear having two parts: a hollow main tube and a barbed spear. Said spear can be stowed inside the tube and the entire apparatus clipped to a diver when not in use. The invention can also be used as a poking stick (for self defense against large sea creatures), a tickling stick (for prodding prey out of small spaces), and as a camera monopole (by using the onboard shoe mount). An objective of the invention is to provide a compact, spearfishing device with multiple functions to enhance the diving experience.

Methods and devices including implantable micro-sensors used to detect tissue-dissolved inert gas and to detect microbubble formation to avoid Caisson disease are described. The disclosed methods and devices are based on measuring the refractive index changes in hydrophobic liquids after absorbing an inert gas such as nitrogen. The changes in the refractive index are based on implementing one of an interferometry, optical microcavity resonance shift, a photonic crystal resonance, a beam deflection, a resonance tuning or detuning, an amplitude change, or an intensity change method.

Methods and devices including implantable micro-sensors used to detect tissue-dissolved inert gas and to detect microbubble formation to avoid Caisson disease are described. The disclosed methods and devices are based on measuring the refractive index changes in hydrophobic liquids after absorbing an inert gas such as nitrogen. The changes in the refractive index are based on implementing one of an interferometry, optical microcavity resonance shift, a photonic crystal resonance, a beam deflection, a resonance tuning or detuning, an amplitude change, or an intensity change method.

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.

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.

A gear cabinet system having two, physically separated, sides providing compartmentalization for wet and dry storage, respectively. The first side provides a first space having ventilation functionality and anti-microbial lighting functionality for drying and sanitizing wet gear. The second side defines a space for storing and displaying dry gear.

A gear cabinet system having two, physically separated, sides providing compartmentalization for wet and dry storage, respectively. The first side provides a first space having ventilation functionality and anti-microbial lighting functionality for drying and sanitizing wet gear. The second side defines a space for storing and displaying dry gear.

An underwater propulsion device is disclosed comprising two sleeves for fitting around each of a user's lower legs, with each sleeve mounting a propulsion unit, and the sleeves being connectable by a bar between them during underwater operation of the device by the user.

A warning notification device includes a sensor, a notification unit, and a processor. The processor is configured to calculate a water depth from an output of the sensor every predetermined time and to calculate a surfacing amount from a change in the calculated water depth every predetermined time. When a long-term surfacing speed condition, which is to be determined on the basis of the surfacing amounts of a first number, is satisfied or when a short-term surfacing speed condition, which is to be determined on the basis of the recent surfacing amounts of a second number smaller than the first number, is satisfied, the processor enables the notification unit to issue a warning of a surfacing operation.