Analysis and optimisation of the anchoring process for concrete caissons at the dock at the Port of Gijón, a work with a uniquely sized vertical structure on the Cantabrian coast. The study enabled the limits of the anchoring operation to be fixed (direction-height-wave times) over and above the technical literature for use, for the specific sizes of the caissons in question. It gave security about the construction times, limited to the spring-summer seasons.