The dua of distress
لَا إِلَهَ إِلَّا أَنْتَ سُبْحَانَكَ إِنِّي كُنْتُ مِنَ الظَّالِمِينَ
La ilaha illa anta, subhanaka, inni kuntu mina-dh-dhalimin.
"There is no god but You, glory be to You, indeed I have been among the wrongdoers."
Narrated by Sa'd ibn Abi Waqqas. Sunan at-Tirmidhi 3505
A short reflection
The dua Yunus made inside the whale. The Prophet ﷺ said: no Muslim ever supplicates with it for anything except Allah answers him.