Services > Missions Infrastructure inspection Video and sonar inspection of underwater infrastructures Infrastructure 3D modeling Use case Structural assessment of the Jean Réveille and d’Estienne d’Orves pier Saint-Tropez, France - 2016 Subsea Tech carried out the 3D underwater modeling of the pier over a 500m distance, using the CAT-Surveyor USV fitted with a multibeam echosounder. 3D sonar models were completed by mini-ROV video inspections to characterize precisely the disorders and point the disorders affecting the pier to provide the client with a complete diagnosis.  Objectives 3D modeling of the pier using a multibeam echosounder Visual inspection of the pier 3D modeling of particular disorders Used equipment CAT-SurveyorCAT-Surveyor Mini-ROV GuardianMini-ROV Guardian SLPMSSeabed SLPMS BlueView 3DBlueView 3D