stˈɛɹ bˈɪldɪŋ ˌɪntʊ ðə kˈævɚn bɪɡˈæn ɪn dʒuːlˈaɪ tˈuː θˈaʊzənd, wɪððə fˈɜːst wˈɔːkɪŋ tˈʊɹz bˌiːɪŋ ˈɔfɚd ɔnðə lˈæst wˈiːkɛnd ɪn sɛptˈɛmbɚ tˈuː θˈaʊzənd.
Stair building into the cavern began in July 2000, with the first walking tours being offered on the last weekend in September 2000.