3D modeling of Rio Miera wreck ship merging optical and multibeam high resolution points cloud

3D reconstruction and virtual reality (VR) technology provide many opportunities for the documentation and dissemination of underwater cultural heritage. Advances in the development of underwater exploration technology have allowed for the first time to accurately reconstruct a complete 3D model of the cargo Río Miera in the Cantabrian Sea. Sunk on December 6, 1951 after a strong collision, the cargo ship Río Miera rests on a sandy bottom about 40 meters deep, very close to the Cantabrian coast. Located in an area of strong currents is a classic objective of the region for the most experienced divers. The survey was carried out this summer in R/V Ramón Margalef of the IEO, acquiring acoustic data with multibeam echo sounders and hundreds of images acquired by a remotely piloted underwater vehicle. The campaign is part of the PhotoMARE project - Underwater Photogrammetry for MArine Renewable Energy. This work describes the workflow regarding the survey, images and acoustic data acquisition, data processing, optic 3D point cloud color enhancement and acoustic and optic dataset merging procedure to obtain a complete 3D model of wreck Río Miera in Cantabrian Sea. Through this project, Spanish Institute of Oceanography - IEO have advanced - combining acoustic and image methods - in the generation of 3D models of archaeological sites and submerged structures.Survey funded by PhotoMARE Project. PhotoMARE - Underwater Photogrammetry for MArine Renewable Energy, was selected as part of the call for grants of the Program I + C = + C 2016, Support for R & D projects in cooperation in Marine Renewable Energies by SODERCAN (Sociedad para el Desarrollo Regional de Cantabria). The authors would like to thank the crew and scientific team aboard the RV Ramón Margalef from the Spanish Institute of Oceanography, for their help with the objectives of the PhotoMARE2018 survey. Thanks to COMPLUTIG for its contribution to the achievement of project objectives