The ledge was part steel and part grout. There were six steel platforms. The three larger platforms measured each; the three smaller platforms measured each. The 6 platforms were supported by 21 pillars of diameter each and plunged for an average of in the granite sea face of Giglio. The grout filled the space between the land side of the platforms and the sea bed. It totaled 1,180 individual bags with a volume of over and over in weight. The grout bags contained an "ecofriendly cement," and were built with eyelets to aid post-recovery cleanup.
