"For one thing there's a no-fly zone over this base," Lehmann said, stepping out of the car. "If you're not SPAIA authorised and you try flying over this place you'll be asked to politely leave...and when that doesn't work you'll be removed by force."<br/><br/>He led Geoff towards the entrance to the building, over which was an image of a tree with sprawling roots above it.<br/><br/>"We love Norse mythology so much we have the World Tree over our door," Lehmann said with a chuckle.