“Swiss Crystal River”. Diver in crystal clear water of Verzasca river in Ticino – Switzerland. This dive site is dangerous if you don't respect the security rules. But it's a fabulous world with rounded rock. You can see across the surface from the bottom of the river. It's a kind of underwater cathedral. Photo location: Lavertezzo, Ticino, Switzerland. (Photo and caption by Marc Henauer/National Geographic Photo Contest)
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