It not that crazy concept for an actually functional drone delivery system. Ocean based wind farms that generate green hydrogen has been suggested as a possible

It not that crazy concept for an actually functional drone delivery system. Ocean based wind farms that generate green hydrogen has been suggested as a possible future method to solve the grid stability issue in a future without fossil fuels (especially in the camp that would rather use fossil fuels than nuclear). If you are already producing the hydrogen in the ocean, having a delivery system of drones that operate on hydrogen and can travel independently to those wind farms to refuel seems like a good match. This assuming that the cost of building the green hydrogen producing wind farm near the ports, the cost of the drones, the control systems and loading/offloading can be competitive to simply using very large ships that burn cheap fossil fuel.