I recently had a course approved by PADI called Understanding Overhead Environments, and I am working on the actual instructional materials. To put it simply, the primary purpose is to explain to recreational divers the differences in the levels of danger of various overhead environments, so that the experienced and cocky veteran of Cozumel swim throughs comes to understand that those skills that are fine there don't work so well in more challenging environments. Ultimately, the goal is to prevent OW divers from entering environments beyond their training and equipment. I want to include photos that show the differences.
Right now I am working on a section showing that all caverns are not alike. It was inspired by the 2012 incident in which a family of OW divers enjoyed a visit to the Jackson Blue cavern and then had an unpleasant experience at Twin, with a fatality narrowly avoided. It would be great if I could get a photo that shows a wide open, well lighted cavern with a rocky bottom--like Jackson Blue--and contrast it with the kind of conditions you find at Twin.
If you have any photos that can show such a contrast that I can use with your permission, I would appreciate it. All due credit will of course be stated.


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