When the Americans built this Storage Warehouse, they had no idea that there were such freaks as Drone Avatars in the world, capable of traversing through solid rock layers underground. The Drone's underground traversal speed was very slow, but it steadily neared the Storage Warehouse.
In the absolute darkness underground, Yan Fei endured the most grueling fifty minutes. In these fifty minutes, the Drone drilled a giant tunnel fifty meters long, brutally making its way from the surface to two hundred meters underground. On his control panel, Yan Fei knew clearly that just fifty centimeters ahead was the wall of the Storage Warehouse; all he needed to do was to keep moving forward, and in thirty seconds, he would be inside the Storage Warehouse.
