Launch Objects into Space

Much like the child who cannonballs into a pool to create the largest splash, fluid action can be used to transfer energy from a larger object to a smaller one. I propose building a gigantic cave in the Earth. Two tube-shaped tunnels can be bored vertically into the cave. One tunnel should be significantly larger than the other. An immense weight can be hauled up, suspended, above the large tube. A smaller object can be placed snugly inside the smaller tube. When the large weight is dropped, it accelerates and enters the large tube, displacing a tremendous amount of air. With no where to go, the air will drive the small object up the small tube and, hopefully, into Earth orbit.