I did fine on the tours, with a 3 mil suit and 2 mil hooded vest. (That was the same setup I dove in the open ocean from Cozumel.) The tours are fairly brief, and you swim throughout, so you don't have to have a lot of exposure protection.
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There is a good bit of info on the Dos Ojos Pit on google. I still wonder if the bones are Myan or planted cow bones, but it was a great dive.Excellent! I want to do the tour into the one with the bones next time!
Mike
Dos Ojos lies broadly parallel to and north of the now combined Nohoch Nah Chich/Sac Actun cave system and may one day be connected into it creating a combined length in excess of 213 km. Dos Ojos has remained in the top 10, if not the top 5 longest underwater cave systems in the world since its discovery in the 1980s. Dos Ojos contains the deepest known cave passage in Quintana Roo with 118 meters / 396 feet of depth located at The Pit cenote discovered in 1996 by cave explorers who came all the way from the main entrance some 1500 meters / 5000 feet away. The deep passages include the Wakulla Room, the Beyong Main Base (BMB) passage, Jills room and the next generation passage.