On his first orbits on the back side of the Moon, Collins performed maintenance activities such as dumping excess water produced by the fuel cells and preparing the cabin for Armstrong and Aldrin to return.
ˌɔn hɪz fˈɜːst ˈɔːɹbɪts ɔnðə bˈæk sˈaɪd ʌvðə mˈuːn, kˈɑːlᵻnz pɚfˈɔːɹmd mˈeɪntənəns æktˈɪvᵻɾiz sˈʌtʃ ɐz dˈʌmpɪŋ ɛksˈɛs wˈɔːɾɚ pɹədˈuːst baɪ ðə fjˈuːəl sˈɛlz ænd pɹɪpˈɛɹɪŋ ðə kˈæbɪn fɔːɹ ˈɑːɹmstɹɔŋ ænd ˈɔːldɹɪn tə ɹᵻtˈɜːn.