Scanning the front page of Reddit I found an awesome photo of bioluminescent algae at a beach in San Diego. The photographer only noticed the glowing waves after a blackout had occurred.
Those of you who’ve seen the movie The Beach will have seen them swimming around in it. The algae do this en masse and it’s often referred to as Milky Seas or the Milky Seas Effect. Sometimes the size of the algal bloom is so big that it can be seen from space when they light up.