sunken
From LSJ
τούτου δὲ συμβαίνοντος ἀναγκαῖον γίγνεσθαι πάροδον καὶ τροπὰς τῶν ἐνδεδεμένων ἄστρων → but if this were so, there would have to be passings and turnings of the fixed stars
hollow, fallen in: Ar. and P. λαγαρός (Xen.).
sunken reef: P. and V. ἕρμα, τό.
