Deepest ray of light
Last updated: October 14, 2017 at 17:38 pm
The deepest a ray of solar light can be perceived by the human eye is 488 m (1,600 ft), or at about one-millionth of the intensity at the surface. Sunlight entering the water may travel about 1,000 m (3,280 ft) into the ocean under the right conditions, but there is rarely any significant light beyond 200 m (656 ft).
NOAA National Ocean Service
Ocean Planet | Smithsonian Institution
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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.