Details about the unmade prequel to The Blair Witch Project have been revealed by the movie's co-writer and co-director Eduardo Sánchez. The original movie, which was released in 1999, was a found footage phenomenon to the point that many viewers were convinced it was a true story. It followed three student filmmakers (Heather Donahue, Michael Williams, and Joshua Leonard playing themselves) getting lost in the woods and tormented by a supernatural presence while shooting a documentary about a local Burkittsville, Maryland legend known as the Blair Witch.
https://screenrant.com/blair-witch-movie-prequel-origin-story-details/