RPGRadar: Can you describe what a ‘sub-terrestrial fortresses’ is through example?

Jan Beuck: When the difference between rich and poor became more and more radical, a lot of people started to fight against the major companies – usually paid by one of their competitors. To protect their secrets from these criminal freelancers, the companies build large fortresses far out in the conterminated wastelands, but soon they turned out not to be save enough. They decided to build even larger ones under the surface. The advantage is that you can´t simply land on the roof – to reach the safest floor you need to pass them all.