Vermilion Oil & Gas Australia Pty Ltd (VOGA) is the licensed permit holder of production licence area WA-14-L, located in Commonwealth waters in the Carnarvon Basin off the northwest coast of Western Australia, approximately 80 km northwest of Dampier and 110 km northeast of Barrow Island in water depths of approximately 54 m.

VOGA are planning near field exploration drilling to identify and confirm viable hydrocarbons to support further development of WA-14-L. Geotechnical and geophysical data is required for Mobile Offshore Drilling Unit (MODU) foundation assessments to support these activities.

The survey will specifically aim to:
• acquire and assess geotechnical data and soil samples to support the safe placement of the MODU’s jack-up legs
• identify sub-seabed features and hazards that may impact on the exact positioning of the MODU
• define any potential hazards or factors of operational significance for MODU emplacement
• identify geohazards and geological conditions relating to drilling of the top-holes
• assist with future wellsite planning.

An Operational Area has been defined as a subset of WA-14-L to encompass 7 potential exploration prospects (Prospect Areas) and allow environmental impact assessment. All planned activities will occur within the Operational Area.

Two project vessels may be required to complete the activities. One that is capable of conducting geophysical surveys (such as a multi-purpose project survey vessel) and one to undertake geotechnical surveys (such as a geotechnical drilling vessel).

Geophysical and geotechnical survey(s) within the Operational Area may use the following survey equipment:
• geotechnical survey scope comprising of:
- seabed grab sampling
- geotechnical boreholes:
• piston/gravity cores and vibrocores
• drilling core holes
• piezocone penetration tests (PCPT).
• geophysical survey scope comprising of:
- multibeam echo sounder (MBES)
- side scan sonar (SSS)
- sub-bottom profiling (SBP)
- magnetometer.
• other survey techniques:
- ultra-short Baseline Positioning System (USBL)
- doppler velocity log and inertial navigation systems
- remotely Operated Vehicles (ROVs)/Autonomous Underwater Vehicles (AUVs).

Each seabed survey campaign will encompass a geotechnical scope and geophysical scope at a maximum of 2 Prospect Areas. The EP allows for up to 7 campaigns to be completed; one campaign for each Prospect Area. For each campaign the geotechnical survey is expected to take up to 10 days to complete and the geophysical survey is expected to take up to 5 days per Prospect Area. Timing and duration may be subject to change due to project vessel availability, unforeseen circumstances and weather.

The first campaign is planned to commence in the first half of 2026; however, exact start dates are subject to vessel availability. For contingency purposes, this EP allows for the activities to occur within 5 years of EP approval. Activities within each campaign will be undertaken on a continual 24 hours per day basis and may occur 7 days a week at any time of the year.

Seismic surveys are not included in the activity scope.