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Message: <blockquote data-quote="Wolverine GTR" data-source="post: 18880379" data-attributes="member: 158020">-Impressive Blue Holes Around The World- A blue hole is an underwater sinkhole formed by the erosion of carbonate rocks and appears as a dark blue circle of water in the ocean. Blue holes are typically located in low-lying coastal regions, which were once above the sea level many thousand years ago. Intense karst activity — the process of dissolution of soluble rocks such as limestone, dolomite, and gypsum by rain water or streams — created large vertical caves. When the sea level rose due to melting of glaciers, some of these holes became submerged. Owing to their depth, blue holes appear darkish blue because of greater absorption of sunlight which increases with increase in depth. This creates a dramatic contrast with the lighter blue of the shallows around them and forms a natural outline that can be easily seen from the surface. The Great Blue Hole of Belize <img src="http://lh3.googleusercontent.com/-Dl3SwyuzH94/Vd2aGAUpflI/AAAAAAABGIM/pHKwnhp-pjk/great-blue-hole-belize-1%25255B6%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> The most famous blue hole is located off the coast of Belize, a small  country on the eastern coast of Central America. It lies near the center  of Lighthouse Reef, a small atoll 70 km from the mainland and Belize  City. The Great Blue Hole is over 300 meters across and 124 meters deep,  and was formed during several episodes of quaternary glaciation between  150,000 to 15,000 years ago. It’s a popular spot among recreational  scuba divers. <img src="http://lh3.googleusercontent.com/-RnmHBW0Y5VI/Vd2aHI1LlII/AAAAAAABGIU/GF6D25uFpVk/great-blue-hole-belize-2%25255B2%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> Dean's Blue Hole Dean's Blue Hole near Clarence Town on Long Island, Bahamas, is the  world's deepest known blue hole. While most blue holes and sinkholes  reach a maximum depth of 110 meters, Dean's Blue Hole plunges to more  than 200 meters, which makes it quite exceptional. At the surface,  Dean's Blue Hole is roughly circular, with a diameter ranging from 25 to  35 meters. After descending 20 meters, the hole widens considerably  into a cavern with a diameter of 100 meters. <img src="http://lh3.googleusercontent.com/-j2dvgIW71ho/Vd2aIszJNiI/AAAAAAABGIc/krgdsp4ZGP4/deans-blue-hole-3%25255B2%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://lh3.googleusercontent.com/-za1FIpWReKE/Vd2aJnsxlHI/AAAAAAABGIk/sv1c-Cexccs/deans-blue-hole-2%25255B6%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://lh3.googleusercontent.com/-DB_p_xop170/Vd2aKhqyFcI/AAAAAAABGIs/QgbKlVuJu0U/deans-blue-hole-1%25255B6%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> Blue Hole of Dahab This blue hole is located on the coast of the Red Sea, a few kilometers  north of Dahab, Egypt. It is the second deepest blue hole at 130 meters.  The Blue Hole has claimed the lives of many divers who tried to find  the tunnel through the reef (known as "The Arch") connecting the Blue  Hole and open water at about 52 meters depth. <img src="http://lh3.googleusercontent.com/-VMrBETZyuLU/Vd2aL4pWjZI/AAAAAAABGI0/aReij0hXqfo/dahab-blue-hole-1%25255B2%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://lh3.googleusercontent.com/-yxMplINAgQQ/Vd2aNBZt3uI/AAAAAAABGI8/35FcfLwBHWY/dahab-blue-hole-2%25255B2%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://lh3.googleusercontent.com/-C_SfBVWXZO0/Vd2aOEw3JvI/AAAAAAABGJE/2KFb2AX0y6A/dahab-blue-hole-3%25255B2%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> The Blue Hole of Gozo The Blue Hole is located on the west coast of the island of Gozo, in  Maltese archipelago, in the Mediterranean Sea. It is a 15 meters deep  and 10 meters wide hole in the bedrock of the cliff. Underwater, the  Blue Hole is connected by a tunnel to the open sea. <img src="http://lh3.googleusercontent.com/-zjHwApFcWLI/Vd2aPRYG3OI/AAAAAAABGJM/-qK87_QDOfM/gozo-blue-hole-1%25255B2%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://lh3.googleusercontent.com/-7p3rfBZwqNU/Vd2aQnySveI/AAAAAAABGJU/OFy22I8K_IQ/gozo-blue-hole-3%25255B2%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://lh3.googleusercontent.com/-Sk1ue8GgRgk/Vd2aUD9SFCI/AAAAAAABGJc/tBkq4B8qq9E/gozo-blue-hole-2%25255B6%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> Watling's Blue Hole Some blue holes also occur on land, such as Watling's Blue Hole located  on the Bahamian island of San Salvador. Despite sitting in the middle of  a rainy tropical island, Watling’s blue hole has no fresh water  indictaing that the hole must be connected to the ocean by an  underground tunnel. <img src="http://lh3.googleusercontent.com/-hrGDz5k1HHA/Vd2aVetuS5I/AAAAAAABGJk/at7LcAMFQ-g/watlings-blue-hole-1%25255B2%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://lh3.googleusercontent.com/-n5Q4MW8PLi4/Vd2aWt1WTWI/AAAAAAABGJs/_0kzX3S8M9c/watlings-blue-hole-2%25255B2%25255D.jpg?imgmax=800" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

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