A scientific detective story to uncover the unique nature of a "super-algae."

French biologist Alexandre Meinesz was diving in the Mediterranean when he spotted a strange blanket of bright green plants on the seabed. Meinesz was alarmed to find that the toxic algae were decimating marine life in the Mediterranean, but his findings were ignored for years by the scientific establishment. Nicknamed the "killer algae,"these organisms have since taken over thousands of acres of seabed, and no one knows how to stop them. Recently they appeared for the first time off the coast of California, and now U.S. officials are struggling to contain their spread up the coast of California.