They took soundings and found that the water was twenty fathoms deep. Going a little farther, they took another set of soundings that read fifteen fathoms.
Textus Receptus (TR) - Acts 27:28 >καὶ βολίσαντες εὗρον ὀργυιὰς εἴκοσι· βραχὺ δὲ διαστήσαντες, καὶ πάλιν βολίσαντες, εὗρον ὀργυιὰς δεκαπέντε·