Once in place in the trachea, in both groups, the ETT will be moved carefully to the midline of the mouth without changing its tracheal depth, and the ETT depth marking at the upper incisors or gums noted. The ETT will be taped in place, and held by hand in place at that exact depth during bronchoscopy. Bronchoscopy will be carried out through the ETT via a bronchoscopic elbow connector, thus requiring no break in ventilation.