I hope someone cancelled the milk. Last thing they'll want to find when they get home after being stuck under ground is 400 pints of cheese on their doorstep.
I found myself wondering if any of them would go back to work down the mines afterwards? Or would they end up being too scared to go into their under stairs cupboard?
I'm just questioning 'what if' they get the angle of drilling by even 1 degree wrong OR they hit a difficult seem etc?
Hitting the target won't be an issue as smaller targets are hit at greater depths on a regular basis, albeit with a smaller diameter hole. I'd have thought that the geology of a mine would be well understood so I can't see that being a problem either.