The company soldier Hannah and the scientists Gavin and Dimitri are researching an algae project on board the Rubikon space station, which is supposed to permanently supply humanity with oxygen and food. But suddenly the earth disappears below them in a brown, toxic fog and all contact is broken off - are they the last survivors of humanity? Should they initiate the safe station, dare the return flight and thereby risk their lives?
Following a catastrophe on Earth, the planet is covered in a toxic fog. The crew in the space station, must decide whether to risk their lives to get home and search for survivors, or stay safe in the station's "algae symbiosis system".