Corrosion under insulation (CUI) is a huge problem on chemical plants and refineries. New noninvasive technology that can continuously monitor the potential for corrosion under insulation on every meter of your critical infrastructure has been trialed in the field. This technology, based on fiber optic sensing, will be discussed for potentially monitoring and preventing corrosion under insulation. Some use cases on pipelines and tanks will also be discussed. Finally, an outlook on additional new innovations based on fiber optic sensing will be provided.