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AroutinedronesurveyturnsdeadlywhenRyanJohnson,amarinebiologistbasedinSouthAfrica,filmsahumpbackwhalebeingattackedandstrategicallydrownedbyaGreatwhiteshark.Thisisatotalperspectiveshiftonacreaturehe'sspenthislifestudying.Tomakesenseofthisevent,RyanfollowsHumpbackwhalesontheirmigration,mappingtheirweakspots.HealsotakesanewlookatGreatWhitesharks.Howdotheybecomewhalekillers?