This contract notice is a Mirror of 2021/S 000-016090 on Find A Tender. NGIH Ltd and Elia Asset SA are currently developing proposals for a High Voltage Direct Current (HVDC) interconnector ‘Nautilus’ between England and Belgium in support of ongoing programs for strengthening both Transmission Networks. The development process has identified the need for a HVDC Interconnector installation over a cumulative distance of approx. 200 km. Survey requirements are thus arisen to establish suitability of a preferred route alignment. To register your interest in this procurement event and to obtain the pre-qualification documentation applicants are to email philippa.henfield@nationalgrid.com using the wording 'Registering Interest for Nautilus Marine Survey' and include in the body of the message (if you have them) your Ariba AN numbers (Network ID), name, email address and contact phone number for all contacts who will need to receive Ariba messages and administer your online submissions.

Marine geophysical survey including, but not limited to:

• survey design and planning;

• multi-beam echo-sounder (MBES) survey;

• side-scan sonar (SSS) survey;

• sub-bottom-profiler (SBP) survey;

• Magnetometer (MAG) survey and in support of pUXO avoidance prior to geotechnical works;

• general video inspection to map cable and pipeline crossing locations and inspect UXO incidents and possible benthic habitats;

• geophysical Survey reporting and charting;

• Data delivery including GIS formats;

• allocation of geotechnical location selection in collaboration with employers;

• final Integration of geophysics and geotechnics; reporting, charting and data delivery, including GIS formats.

Shallow marine geotechnical survey (investigation 3-10 m below seabed), including but not limited to:

• marine geotechnical survey along the propose cable corridors including the intertidal;

• survey design and planning;

• sediment sampling to a nominal up to 6 m below the seabed and preliminary offshore sediment description and basic testing;

• proposal (in collaboration with Employers) and conducting of onshore geotechnical lab testing;

• PCPT survey to a nominal up to 5 m below the seabed and generation of preliminary offshore plots in general for the cable route;

• PCPT survey to a nominal up to 10 m below the seabed for crossing navigation routes, and generation of preliminary offshore plots;

• in-situ thermal conductivity measurements to a nominal up to 3 m below the seabed and generation of preliminary offshore plots;

• geotechnical survey reporting and charting;

• data delivery including GIS formats;

• input into the integration of results with the geophysics.

Marine geophysical survey including, but not limited to:

• survey design and planning;

• multi-beam echo-sounder (MBES) survey;

• side-scan sonar (SSS) survey;

• sub-bottom-profiler (SBP) survey;

• Magnetometer (MAG) survey and in support of pUXO avoidance prior to geotechnical works;

• general video inspection to map cable and pipeline crossing locations and inspect UXO incidents and possible benthic habitats;

• geophysical Survey reporting and charting• Data delivery including GIS formats;

• allocation of geotechnical location selection in collaboration with employers;

• final Integration of geophysics and geotechnics; reporting, charting and data delivery, including GIS formats.

Shallow marine geotechnical survey (investigation 3-10m below seabed), including but not limited to:

• marine geotechnical survey along the propose cable corridors including the intertidal;

• survey design and planning• Sediment sampling to a nominal up to 6 m below the seabed and preliminary offshore sediment description and basic testing;

• proposal (in collaboration with employers) and conducting of onshore geotechnical lab testing;

• PCPT survey to a nominal up to 5 m below the seabed and generation of preliminary offshore plots in general for the cable route;

• PCPT survey to a nominal up to 10 m below the seabed for crossing navigation routes, and generation of preliminary offshore plots;

• in-situ thermal conductivity measurements to a nominal up to 3 m below the seabed and generation of preliminary offshore plots;

• geotechnical survey reporting and charting;

• data delivery including GIS formats;

• input into the integration of results with the geophysics.

Deep marine geotechnical survey (investigation 50-100m below seabed), including but not limited to:

• marine geotechnical survey for platforms;

• survey design and planning;

• continuous sediment sampling and preliminary offshore sediment description and basic testing;

• proposal (in collaboration with employers) and conducting of geotechnical onshore lab testing;

• PCPT survey to a nominal up to 100 m below the seabed;

• additional down the hole testing as required;

• geotechnical survey reporting and charting;

• data delivery including GIS formats;

• input into the integration of results with the geophysics.

Deep marine geotechnical survey (investigation 50-100m below seabed), including but not limited to:

• marine geotechnical survey for platforms;

• survey design and planning;

• continuous sediment sampling and preliminary offshore sediment description and basic testing;

• proposal (in collaboration with Employers) and conducting of geotechnical onshore lab testing;

• PCPT survey to a nominal up to 100 m below the seabed;

• additional down the hole testing as required;

• geotechnical survey reporting and charting;

• fata delivery including GIS formats;

• input into the integration of results with the geophysics.