Having a gas leak in your house would be great cause for alarm. But, in a war zone, having a build-up of explosive gas can be beneficial. Take advantage of what would normally be a bad situation in Gas Leak, a new scenario available for Zombicide: Invader.
From the post:
Instead of killing the Xenos one by one, our new plan is to blast them all at once! This mission is all about timing: all oxygen tanks must be activated at once, and then we have to leave as soon as possible. Are you up to the challenge?