The beginning of the video says that this is free energy. If it is so free, why do they have to develop machinery to collect it? Coal is free, or at least free to people who own the land that houses the coal. Yet developing coal power plants isn't free. Hydro-power plants are expensive. Nuclear power plants are expensive. --- Ideas for forms of harnessing ocean power have been around for at least decades if not centuries. If this kind of power was so free, it would have been developed long ago. Or are we slaves to the power people?