Survivors exist in isolated pockets. The zombies control most of the world. Communication is difficult. But when a giant radio antenna is found in mostly-working condition, it could bring different Survivor groups together and even the score a little bit. That's where you find yourself in All Systems Online, a new scenario that you can download now for Zombicide.
From the post:
Finding a communication antenna in decent condition is a feat in itself, but getting it to work will be no easy task! The survivors will need a lot of teamwork and planning to find the correct circuits and activate them. Let’s get this system started!