Luminousbeings,creatureswiththeirowninternallight,enchantandastonishus.Anyonewhohasseenafireflyoraglow-wormcannothelpbutfallundertheirspell.Theseaatnightsparklesasmillionsofluminousplanktonrevealtheshapesofdolphinsinatrulymagicallightshow.Butwhydoanimalsproducelivinglight?Forcenturieswecouldonlymarvelatthebeautyandthemystery,butnowforthefirsttimewecanbegintorevealtheamazingtruthaboutlivinglights.Ithastakenthreecrucialtechnologicalbreakthroughs.Firstly,colourcamerashaveimproveddramatically;theyarenowover4,000timesmoresensitivethanadecadeago.Thecamerasaresosensitivetheyarerevealingstartlingdiscoveriesthatuntilnowwecouldnotsee.Secondly,scientistshaveenteredtheunknownworldoftheboundlessdeepopenoceanwiththehelpofanewgenerationofsubmersiblesandrobots.Thirdly,AmmoniteFilmshaveinventedandbuiltaseriesofuniquecamerasthatcancapturethefaintestephemeralglowofluminouslife.Bycombiningthesethreeinnovations,thisfilmshowscreaturesandbehavioursneverseenbefore.SirDavidAttenboroughisourguideasweventureintoanewhithertounseenworld.Bioluminescenceiseverywhere:inthesoil,onthelandandthroughouttheoceans.JoinSirDavidAttenboroughandateamoftheworld’sleadingscientistsanddeepseaexplorersonaquesttorevealthesecretsoflivinglights.