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The crashing waves of Bondi and Coogee caught onlookers by surprise as blue light shone from the water, a product of the recent algae infestation.

The algae that turned some of Sydney's beaches red this week is making the ocean glow blue at night.

The striking blue light was spotted at Bondi and Coogee beaches late on Wednesday night, as well as south of Sydney.

I've never seen anything like it in my life. It was like something from space.

Laurence Palmer was leaving dinner with his girlfriend at Bondi when he looked out to sea and noticed the glow.

Blue rhapsody ... scene at Coogee. Photo: Davide Gaglio, http://www.photonature.it

"The most amazing blue light could be seen coming from the ocean. People were standing and staring at the incredible natural light show," he said. "When the waves crashed the sea was turning blue."

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A marine microbiologist from University of Technology Sydney, Justin Seymour, said the algae glows when the water is agitated, leaving a trail of neon blue.

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Red beaches glow blue