The pouring of the gravel on the seabed, will stabilise the seabed. Works includes the setting of 70,000 piles measuring between seven and 12 metres in length. Filled with gravel, the piles will provide stability for the base of the breakwater. Their installation involves four pontoons: floating platforms each measuring 600 square metres. Each one has two cranes.

Two vessels transports to the site a total of 3,000 tonnes of gravel a day. The larger of the two vessels completes a delivery every 36 hours from Piombino, where the gravel is loaded. The smaller vessel does one from Genoa in six hours.

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