ed ▁soldiers ▁sum mon ed ▁incred ible ▁courage ▁to ▁reach ▁the ▁sum mit . ▁The ▁resulting ▁story ▁and ▁foot age ▁was ▁an ▁un im agin able ▁clim ax ▁to ▁the ▁top . ▁Brown ▁and ▁Cin emat ograph ers ▁R ex ▁P ember ton ▁and ▁Did rik ▁John ck ▁( all ▁Ever est ▁summ ite ers ) ▁clim bed ▁alongside ▁the ▁team . ▁The ▁most ▁prom ising ▁gradu ates ▁from ▁Brown ʼ s ▁Out side ▁Advent ure ▁Film ▁School ▁made ▁up ▁the ▁remainder ▁of ▁the ▁film ▁crew . ▁Digital ▁SL R s , ▁including ▁the ▁Can on ▁E OS ▁ 7 D , ▁were ▁used ▁for ▁their ▁light weight ▁port ability ▁and ▁image ▁quality . ▁Each ▁cam er ap erson ▁also ▁carried ▁digital ▁field ▁record ers ▁and ▁f lip ▁cam eras ▁to ▁capture ▁the ▁drama ▁on ▁the ▁clim b . ▁Cold ▁and ▁alt itude ▁were ▁the ▁two ▁environmental ▁factors ▁that ▁presented ▁the ▁biggest ▁challeng es . ▁Fil mm akers ▁charged ▁batter ies ▁at ▁te ah ouses ▁along ▁the ▁tre k , ▁which ▁was ▁an ▁expensive ▁process ▁that ▁required ▁c ash ▁only ▁pay ments ▁in ▁Nep al ese ▁currency ▁to ▁pay ▁for ▁electric ity . ▁Having ▁had ▁experience ▁on ▁previous ▁exped itions ▁for ▁the ▁I MAX ▁films ▁Return ▁to ▁Ever est , ▁and ▁The ▁Al ps , ▁director ▁Brown ▁and ▁his ▁crew ▁understood ▁that ▁fasc in ating ▁story ▁lines ▁often ▁form ulate ▁from ▁base ▁camp . ▁ ▁Edit ing ▁and ▁post - production ▁Over ▁ 7 5 ▁hours ▁of ▁foot age ▁returned ▁to ▁the ▁editing