The waves along San Diego's coastline are lighting up with a bright blue glow.
The bioluminescence is the result of a red tide offshore, according to the Scripps Institution of Oceanography.
Scientists say the blue glow is created by a massive number of dinoflagellates, small organisms that move through the sea. Red tides create conditions that increase these "blooms" of dinoflagellates, possibly because of nutrients or hydrographic conditions in the ocean, but the cause is not entirely understood.
The same phenomenon was seen on San Luis Obispo County beaches last year and was captured by local photographers.
Bioluminescent waves seen on the Central Coast
Photographers in the San Diego area have also been flocking to the beaches there to catch the bioluminescent display on camera.
