UBH MARUM will lead DEMO IV and contribute to WP4 acquiring seafloor images for ground truthing of seafloor classification for benthic habitat assessment approaches and seafloor habitat including the development of an ultra-low power imaging system operated underwater gliders. MARUM will further contribute to WP2 data management, sharing and inter-operability, and to WP8, building new capacities to support ecosystem-based marine resource management.