In Jonah 2, we read how a disobedient Jonah - in the belly of the fish, deep at the bottom of the sea - has no human power over the fish. Jonah 2:10 reports that God spoke to the fish and then the fish delivered Jonah upon dry ground. In the final verses, in case Jonah does not fully appreciate the Power of God, God demonstrates that He can redeem Nineveh any way He chooses. In the process, God redeems Jonah too!

Jonah did not redeem himself. God redeemed Nineveh and Jonah.