As the Russia–Ukraine war rages on, another battle of intelligence and counterintelligence is quietly unfolding in the deep sea. The Canadian firm MetOcean is one of only a handful of suppliers offering solutions in this sector with its NiKA underwater acoustic monitoring system, which was recently showcased at the Taipei Aerospace and Defense Technology Exhibition (TADTE) 2025. Combining precision detection capabilities with versatile strategic value, NiKA can be used in a wide range of applications from submarine surveillance to subsea cable protection.