# What is the most energy-efficient way to crush the hardest bedrock on earth?

What is the most energy-efficient way to crush the hardest bedrock on earth while assuming it is impossible to use the chain reaction energy from that bedrock?

How many energy is needed?

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Depends. How long do you want it to take? –  Ignacio Vazquez-Abrams Jul 19 '12 at 23:38
@IgnacioVazquez-Abrams - For a terminator size robot punch his arm into the bedrock. –  Victor Jul 20 '12 at 0:11
Can you clarify your question. When you say "crush" do you mean break up into gravel? Are you thinking about tunneling through bedrock? –  John Rennie Jul 20 '12 at 8:34
@JohnRennie - yes –  Victor Jul 20 '12 at 15:44