Geotechnical campaigns conducted:

• Geotechnical drilling on shores;
• Geotechnical drilling in water on a barge;
• Seismic reflection studies;
• Seismic refraction studies.

Following the analysis of geotechnical data, several techniques were considered and directed boring proved to be the most optimal technique. The choice of directed boring was confirmed by the feasibility study and risk analysis.

The design calculations for directed boring are executed iteratively according to the following elements in accordance with industry standards:

• Path design;
• Bend radius;
• Pulling forces;
• Induced stresses on the pipes during insertion;
• Induced stresses on the pipes during operation;
• Annular pressure;
• Thickness and resistance of the pipes;
• Design of the pipe supports during pulling.