Acts 27:27-29

27The fourteenth night had come and we were drifting and being driven about in the Adriatic Sea, when about midnight the sailors began to suspect that they were approaching some land.

28So they took soundings [using a weighted line] and found [the depth to be] twenty fathoms (120 feet); and a little farther on they sounded again and found [the depth to be] fifteen fathoms (90 feet).

29Then fearing that we might run aground somewhere on the rocks, they dropped four anchors from the stern [to slow the ship] and kept wishing for daybreak to come.