Video taken in Laguna Beach Wednesday night shows the spectacular sight.
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The footage was sent to Eyewitness News by viewers Mark Girardeau and Patrick Coyne.
The glowing blue hue is from bioluminescence, a semi-regular occurrence, when tiny organisms such as plankton get stirred up and give off this light.
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We saw a lot of it last spring, up and down the coast. But it's hard to predict, so we can't say if this year will be the same.
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