The coordination of the logistics surrounding the working island included the transport of the 450-tonne drilling rig to and from the working island in the Westerschelde. A shear leg hoisted the drilling rig from the quay onto a transport pontoon. At the working island, the shear leg positioned the drilling rig at the proposed location.
After the successful pulling in of the two pipelines, the excavation of the inner cofferdam started. This provided a construction pit with a depth of no less than 12 metres, 10
metres of which lies below the water level. On the new seabed, the two pipelines were welded together by means of spool pieces brought in, which were then cut to size on
One limiting factor was the tidal range; at low tide, the working island dries out. Because of the dynamic area surrounding the working island, weekly surveys were taken
to monitor the ground coverage of the nearby pipelines and backfill it if necessary.
As a result of this project, Visser & Smit Hanab was able to safely drill over 2,700 metres of pipeline under the Westerschelde.