there is more air actually, however, this can hurt you really really bad. This is due to the fact that the brain sensory regarding breathing doesn't know to breathe when there is little oxygen but rather when there is excessive amounts of CO2, you will metabolize all of that oxygen and begin to suffocate before the CO2 builds to toxic levels again telling you to breathe. it can hurt you really bad. stupid brain programming short cuts, rather than monitoring every cell for oxygen necessity, it only monitors the lungs.