TheGiantOarfish,thelargestbonyfishintheworld,wasknownonlybyrareexamplesthatdiedbystranding,aswellasonesolefossil.Itsextraordinarydimensions,aslongas15meters,andshapeintheformofasilverribbon,inspiredthemythoftheseaserpent.Forthepasttwoyears,scientificbuoys,immersedatadepthoftwothousandmetersintheMediterranean,offtheFrenchRiviera,haveattractedcountlessspeciesofpelagicfish;amongthem,theGiantOarfishdriftingvertically,aloneorbypairs.WiththehelpoftheworldexpertinGiantOarfishandlogisticcollaborationofenthusiasts,ascientificexpeditionrevealsthebiologyofthisenigmaticambassadoroftheabyss.EntirelyshotinUltraHighDefinition,thefilmraisestheveilonitsparadoxicalhabits:whydoalltheadultsself-mutilateandridthemselvesoftwo-thirdsoftheirbodieswithoutbeingaffected?Howdotheymeetintheimmensityoftheocean?Whydoesthisfishnothaveanyknownpredators?