The men aboard the ship panicked as the storm got worse.
Jonah told them to toss him into the sea. At first the refused, but as the storm got worse they Prayed to God, "Don't let us perish of this man's life and don't charge us with innocent blood. For You, Yahweh have done as you pleased.
These pagan sailors prayed to the one, true God - Yahweh.
They then tossed Jonah into the ocean and the storm stopped immediately. The men then feared the Lord and made vows to God.
These men were not originally part of "God's plan" for Jonah. They were affected and changed by God even when Jonah originally disobeyed and ran away from God...
As Jonah was in the water God sent a great fish to swallow him and Jonah dwelt in the belly of the fish for 3 days and nights.
Christ was cast out and killed by the people. He was dead for 3 days and nights.
In Matthew 12, the Pharisees demanded a sign from Jesus, he replied, "An evil and adulterous generation seeks for a sign, but no sign will be given to it except the sign of the prophet Jonah. For just as Jonah was three days and three nights in the belly of the great fish, so will the Son of Man be three days and three nights in the heart of the earth. The men of Nineveh will rise up at the judgment with this generation and condemn it, for they repented at the preaching of Jonah, and behold,something greater than Jonah is here.
Christ has come. He is the sign. As Jonah dwelt in the deep for 3 days let us dwell in the truth of Christ's resurrection and as the One greater than any prophet.