"But someone will say, why was the ship not saved also? So that they might know what danger they had escaped, and that all this was not the work of human help, but of God's right hand, which saves even without a ship.
"Thus the righteous, though they are overtaken by a storm in the midst of the sea or the deep, suffer no calamity, but save others together with themselves."
The whole account of chapter 27, down to the smallest details, aims to show that God's word concerning the Apostle Paul's visit to Rome was fulfilled (cf. Acts 23:11; Acts 27:24).
In connection with this, the Apostle's predictions about the successful outcome of the journey were also fulfilled (cf. Acts 27:11, 22).
If we take into account that visiting Rome was the Apostle Paul's cherished desire (cf. Rom 15:23), and formed the starting point for the narrator's account in the final chapters of Acts (cf. Acts 23:11; 28:30-31), then we understand why he dwells in such detail on the Apostle's journey to Rome, which had nearly ended in failure.
The danger of this journey only heightened the interest of the writer, who was himself a participant in it. Here the sacred writer's chief attention is not directed to the precise recollection of stations past which, or at which, the Apostle Paul and the narrator traveled or stopped.
In this case the writer's memory accurately reproduces the picture of the terrible shipwreck that threatened the travelers, and their deliverance from it, precisely because of the importance of the event.
This disaster, which overtook the travelers, could not but make a strong impression on the writer who personally lived through it. Hence the abundance of details.