At a site called U1a, scientists have created a large network of underground tunnels where they conduct these experiments. Each test is performed in a side tunnel, and generally, a small amount of plutonium will be bombarded with some kind of material in order to smash it and release energy. This is what is known as the subcritical experiment. After finishing each experiment, that side tunnel is closed off and filled with concrete.
July 7, 2012 4:00 AM PDT
Photo by: Daniel Terdiman/CNET
| Caption by: Daniel Terdiman
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