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.
We have here the issue of the distress of Paul and his fellow-travellers; they escaped with their lives and that was all, and that was for Paul's sake. We are here told (Act 27:37) what number there were on board - mariners, merchants, soldiers, prisoners, and other passengers, in all two hundred and seventy-six souls; this is taken notice of to make us the more...
Commenting on Acts 27:21-44
Then fearing lest they should have fallen upon rocks,.... Or rough places, as shelves, rocks, or sands, as they might well fear, when the water shallowed so fast, from 20 to 15 fathoms: they cast four anchors out of the stern; or hinder part of the ship; the Ethiopic version calls it, "the head of the ship": and adds, "where the governor sat"; that is...
Verse 28. And sounded. To sound is to make use of a line and lead to ascertain the depth of water. Twenty fathoms. A fathom is six feet, or the distance from the extremity of the middle finger on one hand to the extremity of the other, when the arms are extended. The depth, therefore, was about one hundred and twenty feet. Fifteen fathoms.