Angelita is a sinkhole near Tulum on the Yucatan peninsula. The pit is about 60 feet wide and 200 ft deep. A hazy layer of hydrogen sulfide called a halocline marks the boundary between fresh and salt water, at about 90 feet. If you venture below the halocline, the water begins to clear after about 10 feet, and becomes completely clear again around 110--though there isn't much to see down there.
The main attraction in Angelita is a giant mound of debris and dead trees which extends out of the halocline into the clear water above. Another feature is the swim-through at about 20 feet.
(Gear: GoPro HD Hero 3)
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