As Jonah began to drown & the deep engulfed him - he prayed,
You raised my life up from the Pit, As my life was fading away I remembered Yahweh.
My prayer came to You, to Your Holy Temple.
Jonah realized he, quite literally hit the bottom. While it's far more desirable to turn to God before we hit rock bottom, this proves that there is no sin too great that cannot be forgiven. There is no sin too deep that God's mercy can't search and find.
We cannot hide from His grace - for even in the darkness He is there.