Because the astronauts had their spacesuits on and the spacecraft was so small, maneuvering to exit the spacecraft was difficult.
bɪkˈʌz ðɪ ˈæstɹənˌɔːts hæd ðɛɹ spˈeɪssuːts ˌɔn ænd ðə spˈeɪskɹæft wʌz sˌoʊ smˈɔːl, mənˈuːvɚɹɪŋ tʊ ˈɛɡzɪt ðə spˈeɪskɹæft wʌz dˈɪfɪkəlt.