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Bioluminescent waves occur when microscopic marine organisms called dinoflagellates emit an electric blue glow when disturbed. When physical force—such as a crashing wave, a passing boat, or a footsteps on wet sand—moves the water, a chemical reaction inside these tiny organisms instantly triggers a flash of light. Where and When to See It Bioluminescence can happen anywhere in the world under the right conditions, but it is famous in places like the Maldives, San Diego, Puerto Rico, and occasionally parts of the UK coast. It is often preceded by a "red tide" during the day—a thick collection of algae that turns the water a reddish-brown colour. If you spot a red tide during the day, head back to that beach after dark for a high chance of seeing the bright neon-blue waves.
