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2. Snorkel (swimming) - Wikipedia

   en.wikipedia.org/wiki/Snorkel_(swimming)

   A snorkel is used to allow the user to breathe atmospheric air when their face is immersed in water while swimming or floating at the surface. [1] To work effectively, the snorkel must allow the user to inhale and exhale comfortably over an extended period, and provide a sufficient volume of air with appropriate oxygen and carbon dioxide content to maintain a sufficient and comfortable ...

3. Snorkeling masks for your next underwater adventure - AOL

   www.aol.com/lifestyle/snorkeling-masks-next...

   Snorkeling or scuba diving should be all about taking in beautiful aquatic views, and not about water accidentally shooting into your nose, mouth, or eyes. Diving masks shield your face as you ...

4. Full-face diving mask - Wikipedia

   en.wikipedia.org/wiki/Full-face_diving_mask

   A diver in a pool wearing an AGA full face mask A diver wearing an Ocean Reef full face mask Head protection helmet for use with Ocean Reef full face diving mask. A full-face diving mask is a type of diving mask that seals the whole of the diver's face from the water and contains a mouthpiece, demand valve or constant flow gas supply that provides the diver with breathing gas. [1]

5. Diving mask - Wikipedia

   en.wikipedia.org/wiki/Diving_mask

   A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows underwater divers, including scuba divers, free-divers, and snorkelers, to see clearly underwater. [ 1 ] [ 2 ] Surface supplied divers usually use a full face mask or diving helmet , but in some systems the half mask may be used. [ 2 ]

6. Submarine snorkel - Wikipedia

   en.wikipedia.org/wiki/Submarine_snorkel

   An early submarine snorkel was designed by James Richardson, an Assistant Manager at Scotts Shipbuilding and Engineering Company, Greenock, Scotland as early as 1916, during World War I. Although the company received a British patent for the design, [ 3 ] no further use was made of it—the British Admiralty did not accept it for use in the ...

7. List of signs and symptoms of diving disorders - Wikipedia

   en.wikipedia.org/wiki/List_of_signs_and_symptoms...

   The chamber is pressurised with air to 3.7 bars (370 kPa; 54 psi). The subject in the centre is breathing 100% oxygen from a mask. Although oxygen is essential to life, in concentrations greater than normal it becomes toxic, overcoming the body's natural defences (antioxidants), and causing cell death in any part of the body.