In Plato's cave, people sit facing a wall. Behind them a fire throws shadows, and the shadows are all they have ever named. One person is dragged out into the sun and, after the pain of it, sees the things that cast the shadows. When he returns, the others do not thank him. The allegory is not about a cave. It is about how loyal we are to the first picture.
Worth knowing
The cave is a warning about trusting the only picture you have been shown.