The Poseidon offshore pipeline shall connect Greece to Italy, covering a length of about 220 km with max water depth of ca. 1450 m, in a seismic active area, crossing Greek and Italian Continental Slopes and then landing in Italy, close to Otranto. A Feasibility Phase has identified, with desktop studies, preliminary routes, that are further investigated with the aim to define an optimal route, which is the basis for the future Detailed Survey and balances, among the others, the minimum pipe length with interpreted geo-hazards and third party influences (cable crossings, etc.). Engineering Studies and a Reconnaissance Marine Survey (RMS) will allow determining a Feasible Route Corridor for Detailed Survey. The RMS gathers Geophysical and Geo-technical data, performing in particular: Bathymetry, Sidescan Sonar, Sub-Bottom Profiler. The preliminary routing parameters are updated and reviewed taking in consideration the different constraints and risks, then isolating the most cost-effective routes. A key step is the production of a comprehensive Scope Of Work covering RMS activities aimed at identifying the Route Corridor in Regional Hazard Areas and verifying it for Localised Hazard Areas. An experienced Engineering Contractor has been working with the Client, providing in particular: engineering support, RMS Contractor Scope Of Work, RMS offshore supervision and Final Survey Report Interpretation. This paper describes and analyses the activities, which are performed in order to effectively conduct the RMS and obtain the pipeline route

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