A pipeline apparatus comprising a flexible pipe body and a detection apparatus. The flexible pipe body includes an optical fiber extending at least partially along the length of the flexible pipe body, the optical fiber being encased in a metal tube. The detection apparatus comprises an optical sensor and an electrical sensor. The optical sensor is coupled to a first end of the optical fiber, the optical sensor being arranged to inject optical pulses into the optical fiber and to detect scattered or reflected light. The electrical sensor is coupled to a first end of the metal tube and to detect variation of an electrical impedance between the first end of the metal tube and a separate terminal. Variation of the scattered or reflected light, or impedance variation, is indicative of a potential pipe body defect.