A hot air balloon can lift a lot of weight. But, can it lift it far enough to compensate for the amount of energy it takes to heat it? Not sure if Conservation of Energy applies here or not.
But, what about balloons under water? There would be a much greater energy return from a balloon filled with air and hydrogen under water. How do we get the air and hydrogen to magically appear under water without having huge pumps that use all our energy? Simple, use electricity to seperate the two.
We can recover the electrical energy by harnessing the balloons lift ( tether a cable to a generator or something ) and be using the hydrogen in a generator once it has reached the surface.
NOTE: The deeper the water, the more energy returned.
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