qqp question1: Would it be possible to dig far enough into the ice at the polar regions to sustain ourselves after an earth trauma bad enough we could not surface? question2: If I built a death star over say Tatooine, then decided I wanted to destroy Earth, would I have to make the death star mobile? Or would it be possible (assuming I could collect enough energy) to target and destroy Earth, unobstructed by innocent objects along the way?