One true lighthouse story is about the Eddystone Lighthouse. It has a long and fascinating history. It was built in a very challenging location at sea. The lighthouse keepers there had to endure harsh weather conditions. Their job was to keep the light burning to guide ships safely. This lighthouse is a symbol of human perseverance against the forces of nature.
To some extent. The movie takes inspiration from true events but might have some fictional elements added for dramatic effect and to make the story more engaging for the audience.
The lighthouse in the 'Lighthouse of the Orcas' might be significant as it could serve as a guiding point. It might be a symbol of hope for the characters in the story. Just like lighthouses in real life guide ships at sea, in the story it could be guiding the orcas or the people associated with them in some way.