Paul told them that an angel from God said that they would all survive.

Acts 27:21-26

21 None of us on the ship had eaten for many days. Then one day, Paul stood up in front of us and said, “Friends, you should have listened to me when I said that we (inc) should not sail from Crete. Then we would have been safe, and the ship and its cargo would be in good condition [LIT]. 22 But now, I urge you, do not be afraid, because none of us will die. The storm will destroy the ship but not us. 23 I know this, because last night God, the one to whom I belong and whom I serve, sent an angel who came and stood by me. 24 The angel said to me, ‘Paul, do not be afraid! You (sg) must go to Rome and stand before the Emperor there so that he can judge you. I want you to know that God has made it clear to me that all those who are traveling by ship with you will also survive.’ 25 So cheer up, my friends, because I believe that God will make this happen, exactly as the angel told me. 26 However, the ship will crash on some island, and we (inc) will go ashore there.”