The original requirement that the site be free of craters had to be relaxed, as no such site was found.
ðɪ ɚɹˈɪdʒɪnəl ɹᵻkwˈaɪɚmənt ðætðə sˈaɪt biː fɹˈiː ʌv kɹˈeɪɾɚz hædtə biː ɹᵻlˈækst, æz nˈoʊ sˈʌtʃ sˈaɪt wʌz fˈaʊnd.