Information for DARKFIELD - Seance at Gloucester Guildhall, Gloucester (Event/show). Ready to be terrified In Real Life? Step into Seance. An immersive experience that takes place in complete darkness. Let your senses take over. Will you dare to enter? Seance, a shipping container experience, transforms the interior of a 24ft container into a Victorian séance room. Over 20 minutes it explores the psychology of a group of people, and asks that they believe, not only in what seems to be happening inside the container but also in what might be conjured up into the room with them.