Great Blue Hole underwater sinkhole off the coast of Belize - Image Source/Corbis ©

Great Blue Hole underwater sinkhole off the coast of Belize - Image Source/Corbis ©

Great Blue Hole underwater sinkhole off the coast of Belize - Image Source/Corbis ©

Great Blue Hole underwater sinkhole off the coast of Belize - Image Source/Corbis ©

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