In the early hours of the morning, the fuel tanks of the S-II and S-IVB stages were filled with liquid hydrogen.
ɪnðɪ ˈɜːli ˈaʊɚz ʌvðə mˈɔːɹnɪŋ, ðə fjˈuːəl tˈæŋks ʌvðɪ ˈɛsɹˌoʊmən tˈuː ænd ˈɛsˌaɪvˌiːbˈiː stˈeɪdʒᵻz wɜː fˈɪld wɪð lˈɪkwɪd hˈaɪdɹədʒən.