Then he should know what Prophet Yunus (Jonah) recited in his plea to Allah to save him while he was swallowed in the tummy of the whale/fish, as described in the Quran 21:87:
لَّا إِلَـٰهَ إِلَّا أَنتَ سُبْحَانَكَ إِنِّي كُنتُ مِنَ الظَّالِمِينَ ‘There is no god but You (O my Lord!). Glory be to You! Verily I was of the unjust ones!”