Hi! I am looking into options for setting up a slalom course on a large public lake. The water is pretty deep (20-40 feet deep) in the area it would need to be. A few years ago I ran a course that was permanent, but could also be hidden so that people didn't mess it up or use it. With a press of a button the buoys retracted to the bottom of the lake with potentially a hydraulic type of system. When they wanted to use it again they pushed another button and the buoys were back on top of the water. Has anyone heard of this before or know where to purchase/how to make it?
thanks in advance for any advice.
