National Geographic : 1955 Aug
251 © Kodachromes by Luis Marden, National Geographic Staff An F-80 (left) Drops from Formation, Enacting the Fatal Dive of a Hyperventilated Pilot Tests on student pilots show that many hyperventilate at times because of fear or nervousness. Overbreathing, they could become dizzy and confused and lose control before realizing their danger. The Air Force teaches its men that normal, controlled breathing can save lives. Even holding the breath for brief moments may help.