Actually, simoultaneous "double tunel" digging is an ancient art!
Link: http://en.wikipedia.org/wiki/Tunnel_of_Eupalinos
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- Oh God! They're all over the place! CRASH DIVE!!!
- Ehm... we can't honey. We're in the car right now.
- What?... er right... Doesn't matter! We'll give it a try anyway!
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