Fish and Environmentally friendly ideas for Greenbo SCUBA Area

[mullannix930]

I am trying to get some ideas for things to place in the lake for both divers and to draw fish. The middle of the lake is empty, thus no fish in that area, and I am starting to place platforms and a buoyancy obstacle course in that area. I need some Ideas for other items to put in. The catch is... every item has to be environmentaly safe, and has to be approved by Fish and Wildlife and state Parks. It's a pretty safe bet that they won't let us sink andy boats or cars etc. I have a few ideas, that I am keeping to myself at the moment to try and make a first of it's kind in the area, but I am running out of ideas. Concrete, PVC, and treated lumber are definitely approved.

Please help with some ideas. Nothing is too outrageous, I just need ideas.