Dive, 29 metres down into the Cenote Angelita’s clear freshwater, suddenly there it is. The secret of the ancient Maya people, appearing through the misty haze of the halocline, the surreal scene of an underwater river. This is not your imagination, but the reality of different water densities, with the ancient underwater river a heavier mixture of water and hydrogen sulphide. Nobody will blame you if you suddenly feel a spine-tingling sensation.
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