We’re in 2035. As a consequence of climate change, especially due to plastic contamination and water pollution, the water levels rose with an enormous speed and flooded the entire earth. Human species had to relocate to space. While data secured everyone was evacuated, some disappeared off-radar and were left behind, locked-up on a dirty, dark and demolished planet.
Years later, the first space residents return back to earth on a mission to clean and save the remained nature. In the mids of their cleaning mission, they do a gloomy discovery (2021).