Digging Machines
It dawned on me that the digging machines will almost certainly be completely disassembled. They know that the tunnel out won't be dug for 3-5 years from the end of the war. There will be a period of years between the completion of the base and the beginning of the war that the machines will not be needed. This means there will be X=3 to 5 years when the machine will either need a lot of upkeep. I think it will be easier to take it apart and then put it back together. Just a thought
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