The total height of the bullet would be reduced from 2367m to 641m, which would mean that the drilling cost would be dramatically reduced - a shaft of 341m would be needed.
This is another hack of Jimmy's drawing to show the new scale:
So we need to make a decision, do we go for the gas option? I guess the issues are about purity of the idea, presentation of a 'real' situation (no-one wants to think the bullet isn't the same as the ones fired in movies ;-)), cost, health & safety, etc.
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