Corrosion Under Insulation (CUI) is a significant challenge in the marine industry, where moisture exposure is constant. CUI occurs when water seeps into the insulation around metal surfaces, leading to hidden corrosion that can compromise ship structures and equipment. Effective CUI inspection methods like visual inspections, infrared thermography, and ultrasonic testing are essential for detecting corrosion early. These techniques help prevent costly repairs, extend the lifespan of vessels and offshore equipment, and ensure long-term operational safety. Routine inspections are crucial for maintaining asset integrity in the harsh marine environment.