Abstract: System of submarine linking between the anchoring cylinders of the legs of a platform and the relating foundation piles in which the anchoring cylinders are constituted each by two coaxial cylinders defining between each other a radially expansible annular interspace, the inner cylinder being made of steel with yield strength not higher than the half of the yield strength of the relating foundation pile, which is provided in its turn, in the zones wherein the linkage is to be accomplished, with an inner thickening and with a sequence of slots and toothings on its outer surface as well as, possibly, with inner peripheral ribs.