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Description: A dive in Cenote Angelita, near Tulum, Quintana Roo, Mexico with Danny Riordan.nnAngelita is a water-filled natural inland sinkhole nearly 60m deep; the top part down to about 30m depth is fresh, below that is salt water.The fresh water is clear below a layer of algae in the top few metres, which filters the light to a dim green.Trapped just above the boundary between the salt and fresh water - known as a halocline - at 28-30m depth is a thick milky layer of dissolved hydrogen sulphide emitt
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