ˈæftɚ fˈoːɹ jˈɪɹz ɪn pˈæpjuːə nˈuː ɡˈɪni, kˈɛɹi ɹᵻtˈɜːnd tə sˈɪdni ænd ɹˈoʊt ænd səbmˈɪɾᵻd ɐ θˈiːsɪs fɚɹə dˈɑːktɚɹ ʌv sˈaɪəns dᵻɡɹˈiː, ɛntˈaɪɾəld tɛktˈɑːnɪk ˌɛvəlˈuːʃən ʌv nˈuː ɡˈɪni ænd mˌɛlənˈiːʒə.
After four years in Papua New Guinea, Carey returned to Sydney and wrote and submitted a thesis for a Doctor of Science degree, entitled Tectonic Evolution of New Guinea and Melanesia.