Element 115 is the propulsion source for alien craft capabilities. It has a variety of uses. However, it cannot be found on Earth. Sorry If This Was Posted Before! Good Read and An Interesting Video Listed Below from Bob Lazar, An Area 51 Physicist.

Perhaps the most researched and well-known "flying saucer" known to the world of Ufology is the so-called "Sports Model" which physicist Bob Lazar came into contact with while working at the S-4 facility at Area 51.

The dimensions of the "Sports Model" are 16 feet tall and 52 feet, nine inches in diameter. The exterior skin of the disc is metal and coloring similar to unpolished stainless steel. The craft sits on its belly when its not energized. The entry hatch is located on the upper half of the disc, with just the bottom portion of the door wrapping around the center lip of the disc.

The disc is one of nine, given to the American government in an "exchange" program in the early 1970's. The makers of the craft and providers of the fuel, Element 115, were from the Zeta Reticuli star system. What we exchanged for the technology is not known. A back engineering program began in 1979 of the remaining hardware and technology.

Inside The Disc

The interior of the disc is divided into three levels. The lower level is where the three gravity amplifiers and their wave guides are located. These are the integral components of the propulsion system that are used to amplify and focus the gravity A wave.

The Reactor is located directly above the three gravity amplifiers on the center level and is in fact centered between them. The reactor is a closed system which uses the Element 115 as its fuel. The element is also the source of the gravity-A wave which is amplified for space/time distortion and travel.

The Center level of the disc also houses the control consoles and seats, both of which were too small and too low to the floor to be functional for adult human beings. The walls of the center level are all divided into archways. At one point in time, when the disc was energized, one of the archways became transparent and you could see the area outside of it just as if the archway was a window.

When Lazar was shown the disc, something incredible happened, of which current technology could not produce. A form of writing which was unlike any alphabetic, scientific, or mathematical symbols Lazar had ever seen, began to appear on the one side of the transparent archway. Lazar was never given access to the upper level of the disc so what the porthole-like areas are can't be illustrated, but they're definitely not portholes. The Reactor

The power source is a reactor which uses Element 115 as its fuel. In this reactor Element 115 is used as a target and is bombarded with protons in a small, highly sophisticated particle accelerator. When a proton fuses into the nucleus of an atom of Element 115, it is transmuted and becomes an atom of Element 116. Although we too can transmute elements here on earth, it is typically not done in this fashion, or at anywhere near this level of efficiency. As soon as each atom of 115 is transmuted into 116, it immediately decays and produces a radiation unlike that which we normally observe in nuclear decay. Each atom of Element 116 decays and releases two antiprotons (anti-hydrogen), a form of antimatter. Antimatter can be produced in particle accelerators here on earth, but only in minute quantities and only stored for short periods of time.
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Bob Lazar On Element 115