Located not far from Sameranger Lake in Tyrol, Austria, is the otherworldly Lake Fernsteinsee. The delicate algae and plants covering the lake’s bottom take years to grow, so diving is strictly limited to those with excellent buoyancy control. The crystal-clear water has visibility of more than 130 feet, allowing divers to appreciate the logs, fallen trees and plants that make up this mystical world. It’s an underwater experience unlike anywhere else.

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