Jonah, a prophet of God, finds himself repenting in the putrid belly of a large fish after saying "No" to God's command to go to Nineveh.
Why Nineveh? They were pagans -- idolaters -- immoral -- Israel's enemy. Why didn't God just destroy them?
Jonah was about to learn that nobody is so bad that God can't save them.
So, after three days and nights agonizing inside the whale, he repents, the whale regurgitates, and Jonah obeys.
2 Peter 3:9 The Lord is not slack concerning his promise as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
It's impossible to successfully run from God. Disobedience always creates turmoil in the life of a believer. Failure doesn't disqualify a person from The Lord's service. Thank God for second chances.
Our main concern shouldn't be whether a man can live in a fish, but whether the spirit of Jonah lives in us.