The bomb has grooves in it to make it spin like a drill into the ground, the explode to generate shock waves in the ground to get through concrete and some other bomb-proof objects because the shock waves carry further, longer, and stronger through the ground.
Friends of the Dark Side, your time may soon be at hand. It seems we have a literal death star aiming in our general direction. The culprit is part of a binary star system—two stars which orbit each other—by the name of WR 104. Both are massive and very, very hot. One will eventually explode into a harmless supernova, providing us with a lovely astronomical light show. The other, however, might be deadly.
At least we wouldn't have to worry about global warming anymore.
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