Overview

O n Ocean Z n O n gr h r divide th majority f the ocean midwater nt five br d z n . Th very d t depth f th n is r ughl 2,000 m t r d r th n M unt Everest t ll-36,070 f t deep (10,994 m)! E h z n has a different m x f d t d to t f l ght l v l, pressure, t m r tur , nd community. Ab ut thr -f urth f the r v r d b n d , permanently d rk, nd cold. This th deep . M t r f m l r w th th urf l r, wh h extends d wn 650 f t (200 m) nd r v th most unl ght, ll w ng photosynthetic organisms like phytoplankton t nv rt unl ght t energy. It the h m f d f dolphins, h l of fish, and h l f h rk . S nt t r f r to th highly r du t v r as th epipelagic z n . But th majority f th in th ocean is a dark w rld. Dive b l w th l g nd u w ll nt r the m l g z n . Al known th twilight z n , th r receives nl f nt, f lt r d unl ght, ll w ng n h t nth t rg n m to urv v . Many animals have d t d t th near-darkness w th l rg nd unt r llum n t n. Beginning with th b th l g zone, the n m l t l v d f l ght fr m th un, moon nd stars. An m l create their own b lum n nt l ght nd, f they haven't lost them, h v h ghl l ght- n t v eyes to th l ght produced by th r animals. Th w t r temperature near fr z ng. Tr v l d r nd u w ll f nd th b l g z n -th abyss. And f n ll , the d t r h of th ocean r f und at th b tt m f r t u tr n h . Th locations venture into th h d l l g z n , l so d nl a h ndful of hum n have ever tr v l d th r so f r. TO SEE THE w rld; thr ugh th f a 40-ton polar wh l t h l t use a little bug. At least that's what this t ll t tr k ng tag r mbl . We're r mm d nt n nfl t bl bl k rubb r z d n a blustery d in Ant r t ' Gerlache Str t, utt r ng t w rd a m t nl hum b k wh l . A f t- z d m r w th gangly gr h r-l k antennae nd u t n cup feet sits n a l r t ng n nt t Ar Friedlaender's h uld r . T w r ng b rg nd glacier-draped mountains r r und u . P ngu n arc in and ut of the frigid sea. Ev r f w m m nt the humpback l t loose a l ud xh l t n that sounds l k a w t n r . As we n h to w th n 15 f t f the wh l , Friedlaender drops the l . H u it to gently l th h rml t ll t t g' u t n cups nt wh l fl h. Th t rtl d animal hudd r nd d v . And t begins r rd ng a wh l ' - v w f a changing und r universe, helping r h ur kn wl dg of whale l f n th Southern O n. Th temporary t ll t tag nd video m r n f nl x r ght a r that scientists l k Fr dl nd r are bl t attach to hum b k n th w t r l ng th western side f th Ant r t P n n ul . The d v tr k t n m v m nt and t k v d m g f everything n fr nt f th whale f r 24 t 48 h ur before f ll ng ff nd fl t ng fr . R r h r th n u GPS tracking t r v r th t g before ffl d ng t v d . There's mu h

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