The concept of quantum immortality stems from Everett's interpretation, suggesting that quantum particles manifest all potential outcomes across different parallel universes.
When applied to individuals, this theory implies that during life-threatening situations, there exists a universe where they survive. In this scenario, the person's consciousness transitions to the reality where they endure, while others perceive their death.
Although lacking empirical evidence, this hypothesis is viewed by many physicists as a philosophical idea rather than a scientific theory. Nonetheless, it serves as a thought-provoking illustration of the intriguing nature of probability.