Last updated: February 25, 2018 at 3:42 am
80 m (262 ft) or the approximate visibility of distilled water. A few locations are claimed to equal the visibility of distilled water, including the Silfra Fissure in Iceland, the Weddell Sea (Antarctica), New Zealand’s Blue Lake (a.k.a. Rotomairewhenua), and some Mexican cenotes. Claims of visibility surpassing 80 metres anywhere are likely overstated. However, the Weddell Sea has the added distinction of being composed of seawater that is teeming with life, including plankton.
National Institute of Water and Atmospheric Research (NIWA).
W.W.C. Gieskes, C. Veth, A. Woehrmann and M. Graefe, EOS, 1987.
Witnessed by Diving Almanac & Book of Records official (Silfra, Iceland).
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Jeffrey Gallant is the Editor-in-Chief and Records Keeper of the Diving Almanac. He is also a contributing editor of DIVER Magazine, and the scientific director of the Greenland Shark and Elasmobranch Education and Research Group (GEERG). Jeffrey started diving in 1982.