Acts 27:42

‘And the soldiers' advice was to kill the prisoners, lest any of them should swim out, and escape, but the centurion, desiring to save Paul, stayed them from their purpose, and commanded that they who could swim should cast themselves overboard, and get first to the land, and the rest, some on planks, and some on other things from the ship. And so it came about that they all escaped safe to the land.

The soldiers then advised their commander that the best thing would be to kill the prisoners in order to prevent them from escaping. They were aware that according to regulations to lose a prisoner could mean punishment for themselves of a type which would have been imposed on the prisoner. But the centurion, wanting to save Paul, stopped them from doing so, and commanded rather that all try to get to the shore. Those who could swim were to do so, and get ashore as quickly as possible, and those who could not were to use planks and other floating objects in order to float ashore. And the result was that all escaped to land as God had promised Paul (Acts 27:22).

By this Luke lets us know that in spite of the storms God's work goes forward. All whom He has enrolled/numbered will be saved and none can hinder it.

The Haven. God Reveals That He Is With Paul By Signs (Acts 28:1).

Having landed in what turned out to be Malta Paul had an encounter with a snake which emphasised that God was protecting him from Satan. This was then followed by signs and wonders. The danger now being passed God was confirming His servant's status and revealing that His presence was still with him.