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.

well there is the glow from the returning ejecta turning the entire sky into a broiler oven for a few days ... hate it when that happens, control of the planet goes back to to the meek who were hiding deep underground at the time.