Over the past year harrowing first-hand testimonies from North Korean defectors have detailed execution and torture, and now chilling evidence has emerged that the walls of Camp 22 hide an even more evil secret: gas chambers where horrific chemical experiments are conducted on human beings. Witnesses have described watching entire families being put in glass chambers and gassed. They are left to an agonising death while scientists take notes. The allegations offer the most shocking glimpse so far of Kim Jong-il's North Korean regime.