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2. Snorkeling - Wikipedia

   en.wikipedia.org/wiki/Snorkeling

   Snorkeling (British and Commonwealth English spelling: snorkelling) is the practice of swimming face down on or through a body of water while breathing the ambient air through a shaped tube called a snorkel, usually with swimming goggles or a diving mask, and swimfins.

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. Deep diving - Wikipedia

   en.wikipedia.org/wiki/Deep_diving

   Deep diving has more hazards and greater risk than basic open-water diving. [26] Nitrogen narcosis, the "narks" or "rapture of the deep", starts with feelings of euphoria and over-confidence but then leads to numbness and memory impairment similar to alcohol intoxication.

5. Human physiology of underwater diving - Wikipedia

   en.wikipedia.org/wiki/Human_physiology_of...

   Snorkel breathing is inherently negative pressure breathing, as the lungs of the swimmer are at least partly below the surface of the water. [ 16 ] There appears to be a connection between negative pressure breathing and a higher risk of pulmonary oedema while diving, as it increases the pressure difference between alveolar blood and gas. [ 95 ]

6. I've been to over 50 countries. Here are my 4 favorite ... - AOL

   www.aol.com/ive-over-50-countries-4-142701216.html

   I learned that lesson the hard way when one enormous monkey leaped on my backpack, giving me the fright of my life. ... Bonito, Brazil, is an incredible snorkeling destination.

7. Rebreather diving - Wikipedia

   en.wikipedia.org/wiki/Rebreather_diving

   Another problem is the diver producing carbon dioxide faster than the absorbent can handle; for example, during hard work, fast swimming, or high work of breathing caused by excessive depth for the loop configuration and gas mixture combination. The solution to this is to reduce effort and let the absorbent catch up.