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Underwater, sometimes shortened as U/W, is a term describing the realm below the surface of water where the water exists in a natural feature (called a body of water) such as an ocean, sea, lake, pond, or river. Three quarters of the planet earth is covered by water. A majority of the planet's solid surface is abyssal plain, at depths between 4000 and 5500 m (13,000 to 18,000 ft) below the surface of the oceans. The solid surface location on the planet closest to the center of the orb is the Challenger Deep, located in the Mariana Trench at a depth of 10,924 m (35,838 ft) under the sea.
Although a number of human activities are conducted underwater—such as scuba diving for work or recreation, or even underwater warfare with submarines—this very extensive environment on planet earth is hostile to humans in many ways and therefore little explored.
An immediate obstacle to human activity under water is the fact that human lungs cannot naturally function in this environment. Unlike the gills of fish, human lungs are adapted to the exchange of gases at atmospheric pressure, not liquids. Aside from simply having insufficient musculature to rapidly move water in and out of the lungs, a more significant problem for all air breathing animals, such as mammals and birds, is that water contains so little dissolved oxygen compared with atmospheric air. Air is around 21% O2; water typically is less than 0.001% dissolved oxygen.
More on [ Underwater ]
RT @tweetmeme Underwater Kite Harnesses Ocean Energy : CleanTechnica http://retwt.me/1n1pe
ejsilverman (eric j silverman) Fri, 25 Dec 2009 20:04:54 -0000
RT @tweetmeme Underwater Kite Harnesses Ocean Energy : CleanTechnica http://retwt.me/1n1pe
Joke - Horse jokes: What kind of horse can swim underwater without coming... http://76k.com/j/h0wdl5
Twthree (Twthree) Fri, 25 Dec 2009 20:00:13 -0000
Joke - Horse jokes: What kind of horse can swim underwater without coming... http://76k.com/j/h0wdl5
RT @divinglist: RT @reefwatch: #Ocean acidification = decreasing sound absorption = underwater sound could http://bi... http://ow.ly/16dmzT
therightblue (RJS) Fri, 25 Dec 2009 19:57:45 -0000
RT @divinglist: RT @reefwatch: #Ocean acidification = decreasing sound absorption = underwater sound could http://bi... http://ow.ly/16dmzT
The Mysterious Underwater Ruins of the Lost World http://url4.eu/yyYl
wickedlyhip (enchantrezz) Fri, 25 Dec 2009 19:54:40 -0000
The Mysterious Underwater Ruins of the Lost World http://url4.eu/yyYl
Walking Away From The House She Can Afford: Many homeowners who are tens thousands of dollars underwater on their m... http://bit.ly/7iilii
Vanessa_Milano (Vanessa Milano) Fri, 25 Dec 2009 19:48:27 -0000
Walking Away From The House She Can Afford: Many homeowners who are tens thousands of dollars underwater on their m... http://bit.ly/7iilii
Walking Away From The House She Can Afford: Many homeowners who are tens thousands of dollars underwater on their m... http://bit.ly/7iilii
mrwankers (mrwanker) Fri, 25 Dec 2009 19:48:26 -0000
Walking Away From The House She Can Afford: Many homeowners who are tens thousands of dollars underwater on their m... http://bit.ly/7iilii
Dunk, Linda - Underwater photography from British diver. Offers signed limited edition prints.
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Hampson, Ian - Features a selection of underwater photographs taken on dive trips around the UK and the Red Sea. Limited edition prints available.
Loew, Steve - Underwater photography, available in standard prints and postcards.
Meta Description: [ Steve Loew's Underwater Photography -- Browse and purchase extraordinary ocean prints from underwater photographer Steve Loew. Steve Loew is an active licensed PADI scuba diving instructor and underwater photographer with galleries in Washington, DC, Bethany Beach, Delaware, and Nassau, Bahamas. ]
Malcolm Hey - Underwater images taken around the world. Available as signed limited edition prints.
Meta Description: [ Malcolm Hey is a photographer, writer and tour leader specialising in the underwater enviroment. He is a British Gas Wildlife Photographer of the Year prizewinner on several occasions. ]
Marks, Richard and Mayumi - Offering limited edition, fine art photographs of Hawaiian dolphins in their natural habitat, printed on canvas.
Petrak, John - Underwater photography available as signed Ilfochrome prints and free wallpapers and screensavers.
Meta Description: [ Ocean Photos hosts the underwater photography of John Petrak and offers FREE underwater image Windows Wallpapers & Screensavers from our Photo Gallery. ]
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