At its most basic, Terramil's shelter houses 12 people underground. Inside, it measures about 7 feet high and 20 feet long, and rests securely beneath six-and-a-half feet of dirt. After an excavator digs the hole, the shelter can be set up in about 90 minutes. The standard shelter costs about $20,000, which seems about right for a mostly plastic tube designed to survive the apocalypse. The polyethylene body means the shelter is watertight, and can survive at temperatures from -72 to 176 degrees Fahrenheit. Protection from bombs of all kinds comes courtesy of the dirt and soil placed on top of the shelter, which does an amazing job at stopping artillery blasts.