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I don't know if the certification ever expires, but I was certified 20 years ago or so.
If you're doing your open water dive in the midwest, don't expect a very interesting dive because most of the waters in our area have very poor visibility. If you get a chance to go back to a place like the Caymans, it's a fantastic experience.
I always wanted to dive the Bon Terre lead mines (in the SE corner of MO), but I never got around to it. That seems like it would be pretty interesting.
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