Aargh, bad luck with this challenge! 2 months later I would live close to very spectacular caves! I did the best with what was nearby. An alternative would have been the "Dragon-hole" in the middle of a cliff at 7000 feet. That would be cool, but the weather is bad :(
Processing: 3 shots (-1,0,+1 bracket) combined with HDR.
Shifted the saturation and hue of the pool in order to make it look interesting.
Some dodging and burning, curves and sharpening.
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