Learning Objectives: Subtotal petrosectomy combined with cochlear implantation is a procedure required in specific situations and lowers the risk of repetitive ear infections, CSF leakage, and meningitis by closing off all connection with the external environment. Additionally, it gives excellent visibility and access in difficult anatomy or in drill-out procedures. Here we demonstrate the usefulness of Subtotal Petrosectomy in a case of recurrent chronic otitis media with sensorineural hearing loss in the only hearing ear, where it was possible to perform a simultaneous cochlear implantation.