On the surface, it’s not instantly obvious what brings people here. The scrubby tussocks of grass around the lake’s edge hardly compare to rugged coastline of Croatia or the white sand beaches of Koh Phi Phi. The water is freezing, and the weather is frequently miserable – cold, windy and wet.

But for the tens of thousands every year who brave the elements, the risk of hypothermia and even death, to dive below the surface of Silfra, these are prices worth paying. They’re gaining access to an underwater world like that’s like nothing else on the planet.

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