Services > Operations Bathymetry Elaboration of bathymetric charts 3D modelling of seabed, riverbed, etc. Wreck identification Use case Underwater inspection of the Chalifert rail bridge Marne-la-Vallée, France - 2015 The French Railway Company (SNCF) entrusted the realization of a bathymetric survey and the 3D modelling of rail brige footers to Subsea Tech, next to EuroDisney amusement park. Operations consisted in deploying a multibeam Norbit echosounder from our CAT-Surveyor USV as well as a 3D Blueview sonar BV5000. Images and data were acquired in record time and Subsea Tech pointed out the benefits of using unmanned in terms of operational efficiency and safety. Objectives Underwater civil work 3D modelling of the former Chalifert rail bridge Modelling of the Marne riverbed next to the bridge footers Equipment used CAT-SurveyorCAT-Surveyor SLPMSSeabed SLPMS BlueView 3DBlueView 3D