A high natural wall, without any entry stops the path of Chip towards the Black Tower. The antimatter patrol is about to take him prisoner. Meanwhile, Dr. No makes Gnut, the most useless of his soldiers, test a flying vehicle loaded with a powerful explosive. Gnut, loses the control of the engine, and crashes into the great Wall. The shock makes detonate the explosive and it makes a hole in the wall that Chip uses to cross and move on.