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2. 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]

3. 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 ...

4. Glossary of underwater diving terminology: D–G - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_underwater...

   full duplex. See: Duplex (telecommunications)#Full duplex. Voice communication system where both users can transmit and receive at the same time. Compare with half duplex full-face mask. See: Full-face diving mask. Diving mask covering the eyes, nose and mouth, and which provides the diver with breathing gas full-face snorkel mask

5. Snorkeling - Wikipedia

   en.wikipedia.org/wiki/Snorkeling

   The 1950s US Divers "Marino" hybrid comprised a single snorkel mask with eye and nose coverage and a separate snorkel for the mouth. [4] Full-face snorkel masks use an integral snorkel with separate channels for intake and exhaled gases theoretically ensuring the user is always breathing untainted fresh air whatever the respiratory effort.

6. Underwater diving - Wikipedia

   en.wikipedia.org/wiki/Underwater_diving

   Fins and a diving mask are often used in free diving to improve vision and provide more efficient propulsion. A short breathing tube called a snorkel allows the diver to breathe at the surface while the face is immersed. Snorkelling on the surface with no intention of diving is a popular water sport and recreational activity. [38] [44]

7. Great White Shark Breaks Record with Unbelievable 15-Foot Jump

   www.aol.com/great-white-shark-breaks-record...

   You’ve likely heard the term, “jumping the shark,” but a shark that can jump is hard to imagine. However, in the video above, a 10-foot male great white shark launches himself out of the ...