A ruptured (perforated) eardrum prevents the proper transmission of sound waves to the middle ear and leaves the middle ear vulnerable to infectious agents, water and other foreign substances. A ruptured eardrum (tympanic membrane perforation) is a hole or tear in the thin tissue that separates your ear canal from your middle ear (eardrum).
https://www.mayoclinic.org/diseases-conditions/ruptured-eardrum/symptoms-causes/syc-20351879

