No this is not some terrible ecological disaster… it’s actually quite the opposite. What you’ll see in this video is a miracle of nature the scientists haven’t seen for more than 30 years.
The huge mass that moved with the waves near the beaches of La Jolla, California only looked like an oil spill, but if you look carefully you’ll see it changes shape as the swimmers approach it. No, it’s actually an unusually large school of anchovies that for some reason moved into shallow waters off the coast. And if you thought this looked cool from up above, wait till you see the underwater footage.