haʊˈɛvɚ, ɪt wʌz fˈɪld wɪð sˈɔɪl ænd ˈʌðɚ dˈeɪbɹɪs wˌɪtʃ pɹɪvˈɛntᵻd ˌɛni ɪnvˌɛstɪɡˈeɪʃən ɪnðə nˈaɪntiːnhˈʌndɹɪd fˈɪfti z, ænd hɐz ˈɔːl bˌʌt dˌɪsɐpˈɪɹd tədˈeɪ.
However, it was filled with soil and other débris which prevented any investigation in the 1950s, and has all but disappeared today.