Well, we do have all these unused skies...
. @elonmusk cut cost of space launch and electric cars. If cut cost of tunnels would be even bigger breakthrough!https://twitter.com/elonmusk/status/810108760010043392 …
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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Tunnels are a handy thing to have, on Earth. On Mars, they're a necessity
#BoringCompany#MarsThanks. Twitter will use this to make your timeline better. UndoUndo
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