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15. A Fortress at Sea
A family who live near Mount St. Helens make safety arrangements in case of an eruption; a prepper intends to use his sailboat as a bunker if disaster strikes.

16. Let Her Rip
A Virginia couple worry that political tension and economic unrest will result in a world war; an Oregon man prepares for a terrorist attack; an unconventional Kansas resident eschews modern conveniences.

Source: National Geographic Channel