New method of energy generation landmark use of fusion

I currently have a patent application for a method of energy generation involving pre cutting a monolithic piece of the earth above an underground fusion explosive. The explosive then'pops' the piece of pre cut material from the ground where the large piece of land sort of rolls away from a cavity it creates. Once a cavity is made this way the method further includes operating a turbine/generator by lowering the weight removed or other weight back into the cavity. This method of pre-cutting the surface area of a cube of earth several thousand feet in depth and width and removing it with an explosive may be around 5% efficient to the killowatt power of the explosive which could range into the billions of kwh for a fusion explosive. This method of removing a pre cut piece of the earth with an explosive sounds like a big task but the explosive does all the work, only the sides and bottom of the cube need to be done in preparation. If it costs less to do the pre cutting and the refining and raw materials for the explosive then it would be a valuable use of fusion fuel. I already did experiments with a brick in a shaped cavity dug in the ground and fireworks and the pre cutting method removed 10 times the amount of weight displaced by the same fireworks surface blast. Anyone interested in looking up the patent application can do it by searching Trevor Hawthorne and patentscope. This is the 'cleanest' method for power generation in my patent capable of using the highest percentage of fusion. It is also a fairly safe method when considering contamination. It also is a safe method because a billion dollar business would only need several to ten cavity's created from the dimensions suggested so there would be a limited use of explosives. The use of fission in this method is 8 times more efficient then in current nuclear power plants. The use of fusion is not seen in any other power plants.

So can anyone who is a knowledgeable engineer if you could , try to answer if their is a way to pre cut a cube of land while it still remains in the earth on all sides of the cube if it is 4,000 ft wide and the cost of doing so (remember only the surface area of the cube needs to be cut or removed)?


My main concerns are moving the experimental stage up to larger explosives through government authority, finding investors, and becoming a landmark use of billions of kwh of fusion fuel converted to kinetic energy in weight, converted to electricity by refilling the cavity created.