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Diving Between Continents

Thanks to glacial runoff and a long filtration journey through Iceland's volcanic underground, the water pouring into Lake Thingvellir is some of the cleanest water in the world. Nowhere is that more apparent than in the Silfra Rift, the tectonic boundary between the Eurasian and North American plates. Humanity, an interactive iPad magazine, follows David, who has been diving the Silfra for years