Lost Tools re-found?
Here is a link about a Central Subway being built is San Francisco. 1.6 Billion Dollars and maybe 8 Million Dollars to add another station to take the tool (Tunnel Drill) out of the ground.
They only go forward. If not able to buy for 8 million land space to remove the drill, the Tunnel Drill will be buried to remain in the ground.
Years may pass and some one finds the drill and says who left this here?