Ear barotrauma and deep-water ear crush often occur in air force, navy and parachuting troops. Why do ear barotrauma and deep-water ear crush occur? There is a layer of membrane in the ear, which is the tympanic membrane, also known as the eardrum. Outside the tympanic membrane is the external auditory canal. The tympanic membrane is connected to the back of the nose through a channel called eustachian tube. Therefore, there is air inside and outside the tympanic membrane. Under normal circumstances, the air pressure on both sides of the tympanic membrane should be equal. During the rapid ascent and descent of the plane, Either the diver gradually rises to the surface of the water, or when diving, the surrounding Read More …