Is it plausible to use the buoyancy of air in a controlled column of water to turn a drive shaft and, by extension, generate electricity through a low RPM/high torque turbine? See attached PDF for possible configuration. Only energy input would be to compress air tanks located below the water column. Just wondering if there is a glaring reason why this wouldn't work. Also wondering if there are some formulas for figuring out what kind of RPMs can be generated with the given setup. Any insight into this idea would be appreciated.