Offshore wind parks pose particular challenges with regard to cable routing. Among other things, drilling work has to be carried out under water on the pylons for the wind turbines. Heavy duty energy supply systems are necessary to withstand the difficult environmental conditions and the huge tensile forces when freely suspended over great lengths. The specially developed, media-resistant and flexible offshore e-chain® from igus® routes even cables with large diameters safely to the application. The heavy duty draw cable holds the weight of the system. Intensive tests in the igus® laboratory have proven the extraordinary load bearing capacity of the offshore chain.