Passage 7.24.13
τοιοῦτό γε δὴ κατέλαβεν, καὶ ἕτερον τὴν ἰδέαν, ἐν Σιπύλῳ πόλιν ἐς χάσμα ἀφανισθῆναι· ἐξ ὅτου δὲ ἡ ἰδέα κατεάγη τοῦ ὄρους, ὕδωρ αὐτόθεν ἐρρύη, καὶ λίμνη τε ὀνομαζομένη Σαλόη τὸ χάσμα ἐγένετο καὶ ἐρείπια πόλεως δῆλα ἦν ἐν τῇ λίμνῃ, πρὶν ἢ τὸ ὕδωρ ἀπέκρυψεν αὐτὰ τοῦ χειμάρρου. σύνοπτα δὲ καὶ Ἑλίκης ἐστὶ τὰ ἐρείπια, οὐ μὴν ἔτι γε ὁμοίως, ἅτε ὑπὸ τῆς ἅλμης λελυμασμένα.
Indeed, such a disaster befell them, and another of a similar nature happened, the disappearance of a city on Mount Sipylus into a chasm. From the moment that the mountainside broke away, waters flowed forth at that spot, and the chasm became a lake called Saloe. The ruins of the city were clearly visible in the lake until the water rising from the torrent concealed them. The ruins of Helice are also still visible, although no longer to the same extent, since they have been corroded by seawater.