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Photograph by @paulnicklen // A tech diver descends through a poisonous gas layer of Hydrogen Sulfide in a cenote in Mexico. As we descended deep into this cenote system we were met by this thick gas layer at 110 feet deep. Once through this cloud it was another 150 feet to the cenote floor. This tree provided a reference point as it is easy to become disoriented in a gas layer like this. We went through it quickly to minimize our skin exposure. I do enjoy some aspects of technical…

Mystic sulfate cloud in a deep cenote.

photo by @randyolson | words by @neilshea13 In those days we ate many more animals including hippos and crocodiles and most of all perch biggest and best of the lake fish. We hunted by mood and season and men often went below water with their spears walking the mud-bottom stirring up creatures for the cook-fires. Hunters learned to hold their breath and open their eyes to join the water-world and forget for a while the world of air. Sinking and staying under took skill. Stalking was real…

Swimming through a gorgeous curtain of light always lets you know that there is open sky and breathing air above.

Follow our weekend countdown to the big reveal of the 2015 Traveler Photo Contest winners announcement LIVE! on @CBSThisMorning on Mon. Aug. 3. Visit http://ift.tt/1FblQaG to check out this year's amazing entries. Photograph taken in Bran Brașov Romania by Eduard Gutescu by natgeotravel

Cavediving, Russia

Centro de Manaus

Rio Negro

Divers ascend through shafts of light during their decompression stops after a long dive in a cave system in Mexico.

Centro de Manaus

O Sol.....

Photograph taken by @paulnicklen while on assignment for @natgeo in the Falkland Islands. A Caracara also known as a Johnny Rook plays effortlessly soaring in the in the gale force winds as a squall hits Steeple Jason from the west. In the northwest Falklands during a one hour period it is easy to experience hail sleet extreme winds no wind cold and warm conditions. What seemed challenging to us provides the perfect conditions for 400000 black-browed albatross who need these winds to take…