Because this is a feasibility study, we will only be implanting up to 10 children. We recognize that this small number of subjects may not afford us enough statistical power to adequately answer all questions associated with using an Iowa/Nucleus 10/ 10 mm and a Nucleus Freedom electrode array in contralateral ears in pediatric subjects who have bilateral severe to profound hearing loss. However, it may lend us foundational knowledge to assess whether the Iowa/Nucleus 10/ 10 mm and Nucleus Freedom implants can provide useful bilateral hearing while at the same time preserving the scala media, organ of Corti and supporting cells of the ear implanted with the Iowa/Nucleus 1Oil0 mm array for future advances in molecular and/or genetic treatments of the inner ear.