Separate worlds

(ON HOLD) A Martian city, Horizon Dawn, and a destroyed abandon old world Earth split between two different worlds. Earth had fallen to a nuclear winter cause by a long forgotten war, massive electro magnetic and radioactive storms covers the once blue skies. Blocking any form of communication between the Martian city and earth, no drone or ship were capable of returning home, due to the storms and with the condition earth is, no one would suspect anyone would be alive. Until one day, a random signal of gibberish nonsense was received.