The DEMETRA25 (Deep-sea Ecosystem Monitoring and Effective Technologies for Restoration Actions) cruise was conducted in the period 21 September – 2 October 2025 in the Gulf of Naples. The cruise focused on the Dohrn, Magnaghi, and Cuma Channel submarine canyons, where deep-sea restoration and monitoring activities were initiated in 2024 within the framework of the LIFE DREAM, Horizon Europe REDRESS, and National Recovery and Resilience Plan (NRRP) projects. The cruise aimed to monitor the progress of restoration interventions one year after the deployment of Artificial Reef Structures (ARS) and Artificial Structures for Deep-sea species recruitment and Ecosystem Restoration (ASDER). Operations included the use of Remotely Operated Vehicles (ROVs) to inspect the deployed structures, document coral recruitment and benthic colonization, and perform maintenance of HD cameras, hydrophones, and environmental sensors integrated into the deep-sea monitoring system. In addition to restoration monitoring, the DEMETRA25 cruise explored new areas within the Dohrn and Magnaghi canyons to identify and characterize vulnerable deep-sea habitats.