The other day I saw a program on the Discovery Channel about some archeological cave diving that was being done in a Florida sinkhole. Although the narration described how safety conscious the team was and the video showed them using a reel, I noticed that all the divers were only wearing single tanks. What's more, the narrator said that they were diving to 80 meters, yet as far as I could tell these guys were breathing air. Anybody else see this program? Eric
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