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From the IANTD web site:

Overhead Environment Diver and EANx Overhead Environment Diver 

Purpose 
This Program is designed to develop wreck and cavern diving skills within
the limits of light penetration and to insure that divers are aware of
self-responsibility and capable of risk management in overhead environments.
The Program may be taught using either air or EANx. 
If combined with the IANTD EANx Diver Program, or if the student is already
qualified as an IANTD EANx Diver, the student may use a mixture of EANx in
the range of 21% through 40% oxygen. 
If combined with the IANTD Advanced EANx Diver Program, or if the student is
already qualified as an IANTD Advanced EANx Diver, the student may use a
mixture of EANx in the range of 21% through 40% oxygen as a dive gas, and
safety or required decompression stops may involve EANx mixtures of up to
50% oxygen. 
Prerequisites 
Must be qualified as an IANTD Advanced Open Water Diver or equivalent. 
Must provide proof of a minimum of 10 logged dives. 
Must be a minimum of 15 years of age with a parent or guardian
authorization, or a minimum of 12 years of age for Junior Diver
qualification, or a minimum of 18 years of age without guardian approval.

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