I wish to create a state-of-the-art vertical wind tunnel for indoor skydiving. By state-of-the-art I mean using green technology to create the power necessary to push air, and I would like to reclaim as much energy I can from the movement of air, drive shafts, and anything else I have not thought of but you may have knowledge of. Most tunnels require about 1000 hp to move enough air in a 3 metre wide tunnel. I want a 6 metre wide tunnel and that would require much more energy, and if I can exhibit how this can be done using minimal energy production through innovation and ingenuity then it would be a good example for others, and will of course reduce operating costs. Thank you.