It allows the creation of parts in shapes that conventional techniques cannot achieve, resulting in new, much more efficient designs in aircraft wings or heatexchangers, for example.
These pens would bob 60 feet below the surface, kept in place with motors powered by heatexchangers that use the temperature difference between deep water and shallow water to generate electricity.
The heatexchangers and pipework required to make a 10MW plant already exist, but the 100MW facility will need a pipe that is not only 1km long (in order to reach the cold water at depth) but ten metres in diameter (in order to bring enough of that cold water to the surface).