CGG Services (Australia) Pty Ltd proposes to conduct the Sauropod 3D marine seismic survey in exploration permit area WA-527-P (under SPA (application number LWZLKT)), located on the North West Shelf within the Roebuck Basin off the coast of Western Australia. This survey aims to acquire three-dimensional geophysical data to inform oil and gas exploration activities by imaging subsurface rock formations.

The survey will be conducted within Commonwealth waters approximately 120 km from the WA coast near Pardoo and 230 km from Broome. The operational footprint includes an Acquisition Area of up to 3,500 km² where the seismic data collection will take place, surrounded by a broader Operational Area of approximately 6,000 km² to accommodate vessel manoeuvring, such as line turns, run-ins, run-outs, seismic source testing, and soft-start procedures. Water depths within these areas range between 65 and 170 meters.

The Sauropod 3D MSS is planned to occur between early January and the end of May in 2026 or 2027, with a maximum duration of 60 days including downtime for weather, maintenance, marine fauna avoidance, and stakeholder notifications. Data acquisition will operate 24 hours a day with scheduled shutdowns for maintenance, transit, line turns, and environmental considerations.

Supporting activities will include refuelling, resupply, use of support vessels, and crew changes within the Operational Area. This revised Environment Plan updates the survey timing but retains the original survey methods and location as previously approved by NOPSEMA in April 2024.