Massive SPOILERS ahead in our explainer breakdown of the ending of The Lighthouse!
Robert Eggers’ The Lighthouse tells the story of two lighthouse keepers assigned to run and maintain a lighthouse off the coast of Maine. But since this is a Robert Eggers movie, things don’t go quite according to plan. “It was always the idea to have this film be a bit obscure and ambiguous and, for lack of a better word, weird,” Eggers recently told Esquire. “That it would be, maybe not scary, but tense and hallucinatory and strange and provoke more questions than it would provide answers.”
Source: IGN.com The Lighthouse Ending Explained: Lovecraft, That Light and More