On certain evenings along the California coast, the Pacific Ocean appears to behave strangely. Waves roll towards the shore carrying an electric-blue glow, while surfers leave bright trails behind them as they move through the water. Beaches that look ordinary during the day can take on an almost unreal appearance after dark, drawing photographers, kayakers and curious onlookers to the shoreline.
The phenomenon has been attracting growing attention in recent years, particularly during periods when glowing patches become visible across parts of Southern and Northern California. Although the sight can seem unusual, it is the result of a natural biological process taking place in the ocean. Tiny organisms suspended in seawater are responsible for the flashes of light, creating one of the most recognisable examples of marine bioluminescence.
