This dataset provides information on the first expedition conducted by the RAMOGE agreement in 2015. Established in 1976, the RAMOGE Agreement enables the 3 member countries (France, Italy and the Principality of Monaco) to implement joint and coordinated actions to limit marine pollution and preserve the coastline and marine environment between Marseille (France) and La Spezia (Italy), fully including the Southern region (France) and Ligurian regions (Italy), as well as the Principality of Monaco. This Agreement is part of the Barcelona Convention. With over forty years of existence, it is a symbol of sub-regional cooperation and solidarity for the preservation of the Mediterranean. This exploration was organized using Italy’s maritime resources in 2015, with R/V ASTREA and ROV Polluce III. Fifteen dives were conducted to explore Arma di Taggia and Bordighera canyons in Italy, Dramont canyon and the Nioulargues shoal in France and several deep rock formations in Monaco. All these explorations covered approximately 21 km , recorded 22 h 24 min of video and documented 1791 events at depths ranging from 49 m to 462 m. Metadatas : Events : ID unique of the observations Dive name : name of the dive. Composed by sites, names of ROV, dive number of the mission and the date Area explored name : toponymy of area Exploration vehicle name : name of the vehicle used to conduct the exploration Exploration vehicle type : type of vehicle used to conduct the exploration Exploration vehicle owner : owner of the vehicle used to conduct the exploration Date : date of the observation (mm/dd/yyyy) Time : time of the observation (hh :mm :ss) Latitude : latitude in degrees (WGS84) Longitude : longitude in degrees (WGS84) Depth : depth of the observation Data source : nature of equipment served to describe the observation (video or picture) Landscape : qualitative description of the landscape complexity Slope : qualitative description of the slope Substratum : qualitative description of the substratum Typology of habitats : typology of habitats described in the context of the Barcelona Convention (Montefalcone et al., 2022). The description of habitat is defined at level 3 or 4. Facies : typology of habitats described in the context of the Barcelona Convention (Montefalcone et al., 2022). The description of facies is defined at level 5 of the typology when it’s possible. Waste : qualitative description of the waste when a waste is observed Specific action : description of action realized with the vehicle (i.e. start of exploration, sampling) Other description : other description about landscape, non taxa observation Taxa : identification of the observation to the most accurate taxa Clear determination : Right if identification is sure ; False if identification is uncertained Abundance : number of individuals or wastes observed Equipment : R/V ASTREA ROV Polluce III (Video FullHD) HD video camera Sony Photo camera Canon EOS 550 Sonar EM 2040 Kongsberg Video derushing carried out by : Fourt M. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

The measurements of Secchi depth were done within Estonia-Latvia transboundary project "Towards joint management of the transboundary Gauja/Koiva river basin district" for harmonization of water quality classification system for transboundary water bodies in the Gauja/Koiva river basin district and adjacent areas (in Estonia) in the Gulf of Riga." The measurements were done once in August 2012 along with underwater video observation, SPM, TN, TC, Chlorophyll a and CTD measurements in coastal waters in shallow part (2 - 12m) of the East coast of the Gulf of Riga. Data were used for Final report on assessment of the quality status of the transboundary water bodies (coastal, lakes, rivers) in Gauja/Koiva river basin district (2013. Kalvane I. and Veidemane K. (eds.))

A geotechnical survey campaign was undertaken within the vicinity of the Westermost Rough Offshore Wind Farm. This was supported by a preliminary review of acoustic data and assessment for the presence of Annex I reefs to minimise the risk of potential damage to protected features. Following the review of existing data, a drop down video survey protocol was developed (EMU, 2011) and approved by the Marine Management Organisation (MMO). Part of this protocol identified that a number of proposed geotechnical sampling sites were likely to be in the vicinity of potential Annex I reefs and therefore warranted field ground-truthing by means of drop down video to verify the presence and status of these features. The video ground-truthing survey has now been completed. Drawing upon the findings of this survey, the 2012 EMU report present within this series provides an update of the assessment of the potential Annex I reefs present at the proposed geotechnical sample locations and fulfils condition 3.1.1 of the Marine Licence (Licence L/2011/001075). The aim of the 2013 Fugro EMU document also present within this series was to satisfy Marine Licence condition 31.22 and to address the responses from the MMO regarding the Annex I reef features (letter ref: REN024, dated 12th April 2013, and 21st June 2013). The objectives were to assess the impacts (direct and indirect) of the construction activities on the potential Annex I features. The objectives of this report were to: 1. Assess the direct impact (loss of habitat) of each of the construction activities; 2. Assess the associated indirect impacts (increase in sediment smothering, and suspended sediment concentrations. 3. Assess the cumulative impacts of all construction activities.