Phantom Force plot
When the nuclear research submarine Venture picks up a strange object from the ocean floor, the scientists on board decide to investigate. What they don't know, however, is that this is the legendary Hades stone. In Greek mythology it was written that this stone gave access to the realm of the dead. The researchers soon discover that this stone has supernatural powers. When an experiment reveals that the stone reveals its secrets and the demons guarding the portal to the realm of the dead take possession of the submarine, the crew can do nothing but send a distress signal. After that, further contact with the submarine is no longer possible. The Navy decides to take the call seriously and sends in a special team experienced in paranormal phenomena.