Apneic oxygenation without nasal prongs – the “Hungarian Air Ambulance method”. a The intubator preoxygenates the patient with a non-rebreathing mask (15 lpm). Upper airway patency is maximized by two naso- and one oropharyngeal airway. b The intubator cuts the tubing of the mask after the onset of apnea. c The intubator removes the mask and inserts the free end of the tubing approximately 3–5 cm deep into the nasopharyngeal airway. d The laryngoscopy is performed with the “tube in the tube”