I believe that the 1 mile down comes from the current proposed methods of disposing of nuclear waste. Essentially, you place the reactor in it's final resting p

I believe that the 1 mile down comes from the current proposed methods of disposing of nuclear waste. Essentially, you place the reactor in it's final resting place, removing the need to transport it to a disposal site. Depending on the site you would bury either deeper or shallower depending on the geological stability of the region. https://www.science.org/content/article/finland-built-tomb-store-nuclear-waste-can-it-survive-100000-years https://www.science.org/content/article/finland-built-tomb-s...