ARMS-MBON is a network >25 partners who deploy Autonomous Reef Monitoring Structures (ARMS) in the vicinity of marine stations and LTER sites in European coastal waters and Ant/arctica. After a few months the units are brought up, and visual, photographic, and genetic assessments are made of the organisms on them. These data will be used to assess the status of, and changes in, the hard-bottom communities of these near-coast environments. The project began in 2018 and in 2023 it will be merged into EMBRC's EMO-BON project. The data here are a spreadsheet with the event metadata and the ENA accession numbers (only for the events that resulted in ENA data), and a spreadsheet with the download links to the images and visual observations made during the sampling events. This data is continuously updated as new events are completed, new sequences are added to ENA, and new image data are created. More data and all documentation can be found on the ARMS-MBON GitHub repository.