"When the hero emerges from the belly of the whale, the initiation stage begins. The hero finds themselves in another world. Here, they go through a series of trials. This stage is often the longest. For example, the labors of Hercules or Neo's training. In a three-act structure, this is theoretically the first half of the second act. It is at this point that the hero realizes the fear experienced in the belly of the whale was not as terrifying as it seemed."

Quote from a course about dramaturgy.