ðɪ ˈoʊnli nˈoʊn ɛɡzˈæmpəlz ʌv ðɪs fɪnˈɑːmɪnən ɑːɹ ðə sˈɛvɹəl ˈaɪs plˈʌɡz æt ðə bˈæk ʌv kˈæsəlɡˌɑːɹd kˈeɪv ɪn ælbˈɜːɾə.
The only known examples of this phenomenon are the several 'ice plugs' at the back of Castleguard Cave in Alberta.