Passage 10.19.2
οὗτοι περὶ τὸ ὄρος τὸ Πήλιον ἐπιπεσόντος ναυτικῷ τῷ Ξέρξου βιαίου χειμῶνος προσεξειργάσαντό σφισιν ἀπώλειαν, τάς τε ἀγκύρας καὶ εἰ δή τι ἄλλο ἔρυμα ταῖς τριήρεσιν ἦν ὑφέλκοντες. ἀντὶ τούτου μὲν οἱ Ἀμφικτύονες καὶ αὐτὸν Σκύλλιν καὶ τὴν παῖδα ἀνέθεσαν· ἐν δὲ τοῖς ἀνδριᾶσιν ὁπόσους Νέρων ἔλαβεν ἐκ Δελφῶν, ἐν τούτοις τὸν ἀριθμὸν καὶ τῆς Ὕδνης ἀπεπλήρωσεν ἡ εἰκών. καταδύονται δὲ ἐς θάλασσαν γένους τοῦ θήλεος αἱ καθαρῶς ἔτι παρθένοι.
These, during a severe storm that fell upon Xerxes' fleet at Mount Pelion, actively contributed to its destruction, bringing ruin upon them by diving down and cutting loose the anchors and whatever other mooring devices held secure the triremes. In return for these deeds, the Amphictyons dedicated statues of Skyllis himself and his daughter. Among those statues taken from Delphi by Nero was included the image of Hydna as part of that group. It is said that even now pure maidens of the female sex dive into the sea.