wˈʌn ˈɜːli ˌɛkspədˈɪʃən ɪz kɹˈɛdɪɾᵻd wɪð dɪskˈʌvɚɹɪŋ ðə ɹˈɛɹ ænd pɹəlˈɪfɪk dɪsplˈeɪ ʌv hˈɛlɪktˌaɪts ɪnðə lˈændmɑːɹk ɹˈuːm ɪn nˈaɪntiːnhˈʌndɹɪd fˈɪfti fˈoːɹ.
One early expedition is credited with discovering the rare and prolific display of helictites in the Landmark Room in 1954.