For whom? I can make a 2 day trip, 200 miles to cave country, fuel, 2 nights camping, food, site admission, gas, etc. all for about $300 for two people if we dive air, or about $400 if we dive nitrox. Based on your estimates, it would be over $600 to dive mix. Not including much consideration of extra deco gas, number of dives (do people make repetitive 200' dives in a day?).
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