Not to mention we would need to survive the aftermath - possibility of debris kicked up into the atmosphere blocking the sun for months or years, chain reaction

Not to mention we would need to survive the aftermath - possibility of debris kicked up into the atmosphere blocking the sun for months or years, chain reaction of volcanic eruptions with the same side effect plus lava, mass plant and wildlife die-off leading to possible global ecosystem collapse, raised global temperatures and water levels, and shifting tectonic that could possibly shift elevations and flood wherever this 'facility' is located. I'm sure there's many other issues I haven't thought of off the top of my head.