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Yesterday I had some free time for the first time in a few weeks, so 
I looked at the techdiver archives.

I saw in there someone who said he was a "TDI Extended Range Diver" 
in his signature.

I've always wondered this; What exactly is an "Extended Range Diver"? 
Why should I be impressed? 

I've seen people like Hal Watts offering courses in "Extended Range 
Diving", but always just assumed it was a clever ploy to seperate 
divers from their money in exchange for another badge, but could 
never prove that. Is this indeed the case?

Thanks for the answers,

Ken

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