s ▁category , ▁with ▁the ▁c itation : ▁" A ▁thr iller ▁with ▁super b ▁acting , ▁a ▁high - quality ▁production . ▁Great ▁cinemat ography , ▁out standing ▁acting , ▁excellent ▁direct ing ." ▁ ▁V iewer ▁numbers ▁ ▁The ▁two ▁first ▁episodes ▁were ▁seen ▁by ▁ 1 . 2 5 9 ▁million ▁in ▁Norway , ▁the ▁third ▁episode ▁was ▁seen ▁by ▁ 1 . 2 3 9 ▁million ▁and ▁the ▁fourth ▁by ▁ 1 . 2 8 8 ▁million . ▁The ▁fifth ▁episode ▁was ▁seen ▁by ▁ 1 . 3 1 9 ▁million ▁while ▁the ▁last ▁was ▁seen ▁ 1 . 3 2 2 ▁million . ▁The ▁last ▁episode ▁was ▁watched ▁by ▁ 6 4 % ▁of ▁TV ▁view ers ▁that ▁hour . ▁ ▁Historic ity ▁ ▁From ▁the ▁première ▁there ▁has ▁been ▁debate ▁over ▁its ▁historical ▁accuracy . ▁Among ▁concerns ▁have ▁been ▁He isen berg ' s ▁invol vement ▁in ▁the ▁development ▁of ▁nuclear ▁weapons ▁and ▁all us ions ▁to ▁his ▁hom osex ual ity . ▁ ▁Pre vious ▁versions ▁ ▁The ▁same ▁story ▁was ▁covered ▁in ▁the ▁ 1 9 4 8 ▁Franco - N or weg ian ▁film ▁K amp en ▁om ▁t ung tv ann et ▁( also ▁known ▁as ▁La ▁bataille ▁de ▁l ' eau ▁l our de ▁or ▁Operation ▁Sw allow : ▁The ▁Battle ▁for ▁He avy ▁Water ). ▁Qu ite ▁faithful ▁to ▁real ▁events , ▁it ▁even ▁had ▁many ▁of ▁the ▁original ▁Norwegian ▁command os ▁st arring ▁as ▁themselves . ▁ ▁The ▁ 1