yes, it was true overhead. The only place whre it was open to air where the entry points and visible exits and a room with stalagtites and stalagmites and tree roots inside of Little Brother Cenote.
The guides are required to wear doubles, everyone has two sources of light and you were never out of sight of a opening to daylight. They take a real leaisurely time going through the vavern stretching what would be a 20 minute dive into 30-40 minutes.


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