Paul with other prisoners was sent on a ship of Adramyttium to Italy, and Julius (a centurion of the Roman army) courteously treated Paul.
Paul and the prisoners got moved to another ship (of Alexandria) which also went to Italy.
Very difficult, dangerous, and life threatening journey on the ship.
God comforted and encouraged Paul, so Paul did the same for the 275 people who were with him on the ship (276 with Paul).
Just as God promised to Paul, everyone got safely to an island and the ship got wrecked.