The foundation structure consists of a mono pile made of steel with large diameter which is installed by rock drilling and fixed with high-strength mortar.
The conditions at offshore sites for tidal power have extreme side conditions. Wind and waves, very strong current of up to 5 m/s whereupon the direction changes periodically, are added by water depths of up to 60 m and rocky sea bed.
The underwater drilling rig BSD 3000 is operated from a work boat which is kept into position via a control mode run by GPS. Rotary drilling is applied with full face roller bit and heavy weights with air flush, which hardly affects the surroundings.