These are the most recognized phrases used in marketing and within the book/film:

While does not have an official "subtitle" in the traditional sense, it is frequently associated with the provocative line: "A story that will make you believe in God."

If you need "content" to go under a title, use this concise summary:

After a tragic shipwreck, young Pi Patel finds himself stranded on a lifeboat in the Pacific Ocean. His only companion? A fearsome Bengal tiger named Richard Parker. Together, they must endure the elements and their own nature in a journey that blurs the line between reality and myth.

"One boat. One tiger. One impossible choice. 🐅🌊 #LifeOfPi"

"The Truth Behind the Island" or "Life of Pi: The Ending Explained." Brief Synopsis

"227 days at sea. 450 pounds of Bengal tiger." Thematic Subtitles