The temperature and salt content of the cave's water indicates that it originates from sources deep underground.
ðə tˈɛmpɹɪtʃɚ ænd sˈɔlt kˈɑːntɛnt ʌvðə kˈeɪvz wˈɔːɾɚɹ ˈɪndᵻkˌeɪts ðˌɐɾɪt ɚɹˈɪdʒᵻnˌeɪts fɹʌm sˈoːɹsᵻz dˈiːp ˌʌndɚɡɹˈaʊnd.