I am at a NAVY school and today was the "Confidence Chamber" also called the gas chamber. We have to go in with our masks on then once the gas was lit off we removed the mask and had to say the sailors creed. Nobody got past the forst 3 words before we were in total agony. They kept us there for about 3 minutes and let us out to the fresh air. It passes pretty quick once we got outside. Let me tell you that stuff HURTS!!!