A jellyfish, Atolla sp., flashes bright blue when threatened. Recent research from MBARI researchers Séverine Martini and Steve Haddock shows that bioluminescence is not rare. Using data from hundreds of ROV dives, and recording every occurrence and kind of glowing sea creature, they found that three quarter of deep-sea animals make their own light. Ever since explorer William Beebe descended into the depths in a metal sphere in the 1930s, marine biologists have been astounded by the number and