During descent, a malfunction caused Luna 15 to crash in Mare Crisium about two hours before Armstrong and Aldrin took off from the Moon's surface to begin their voyage home.
dˈʊɹɹɪŋ dᵻsˈɛnt, ɐ mˌælfˈʌŋkʃən kˈɔːzd lˈuːnə fˈɪftiːn tə kɹˈæʃ ɪn mˈɛɹ kɹˈɪsiəm ɐbˌaʊt tˈuː ˈaʊɚz bᵻfˌoːɹ ˈɑːɹmstɹɔŋ ænd ˈɔːldɹɪn tˈʊk ˈɔf fɹʌmðə mˈuːnz sˈɜːfɪs tə bɪɡˈɪn ðɛɹ vˈɔɪɪdʒ hˈoʊm.