[Machine Translation] The sealed cellar becomes the door to hell - an evil that cannot be resisted by reason is finally unleashed. This film, produced in response to the occult horror boom of the 1970s, combines the classic theme of the "haunted house" with the terror of demonic beings. The film does not rely on flashy direction, but rather quietly creeps up on the viewer's nerves, slowly eroding them. The film stars Richard Crenna, a familiar face from the "Rambo" series. He plays the role of a rational doctor and convincingly portrays the human conflict in the face of supernatural phenomena. His presence adds dignity and reality to the film. The setting of "something" sealed in a basement symbolizes the fear of the unknown and the danger of the human spirit of inquiry. The classic yet universal theme of opening a door that should not be opened drives the story strongly. / The direction, which emphasizes psychological pressure rather than visual shock, is extremely sophisticated from a modern perspective. This is an occult horror film for the connoisseur who can enjoy the horror lurking in the silence. In this film, doctor C.J. Arnold and his wife Caroline purchase an old mansion and plan to rehabilitate it as a rehabilitation facility for drug addicts. The house is an ideal environment of tranquility, but something terrible has happened there in the past. During the renovation, a door is discovered in the basement, which is sealed tightly. Arnold, sensing a disturbing presence, is motivated by reason and curiosity, and opens the seal. At that moment, an evil presence sleeping in the mansion awakens. Soon, the people gathered at the facility are struck by inexplicable phenomena and hallucinations, and lose their mental equilibrium. Suspicion and fear are amplified in the enclosed space, and distrust of each other grows.