After the 'Silent Ecstasy' event, all stars and habitable planets in the universe vanished, leaving humanity clinging to life in decaying space stations. Prisoner Simon, sentenced to death, is offered a deal: pilot a battered submarine nicknamed 'Iron Lung' to the Blood Ocean on the barren moon AT-5, find the lost planets and resources, and earn his freedom. The sub has no windows, relying only on external cameras and sonar. As Simon navigates the endless red deep, the camera feed flickers, and sonar picks up mysterious knocking. Water seeps in, red liquid floods the hull, and an unseen presence watches his every move, enveloping him in isolation and dread.
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