It happened at Newark
Quite a while ago a pile driving crew was driving piles for a new garage at Newark.
They hit a concrete conduit that was not supposed to be there. It was a glancing blow. So they moved over and tried again,.
This time they penetrated the conduit and hit the main power line to various parts of the airport , including the control tower and Customs in Terminal B.
For added measure the back up power line was in the same conduit bank and it was hit as well. !
Nothing moved for about 6 hours and all the inbound international arrivals had to wait for customs to get power back.
Seems the control tower had a back up gen set so they were OK.