human
So you have taken a contract to run a tunnel into this hill two hundred and fifty feet to strike this ledge?
gpt
Yes, sir.
human
Well, do you know that you have got one of the most expensive and arduous undertakings before you that was ever conceived by man?
gpt
Why no--how is that?
human
Because this hill is only twenty-five feet through from side to side; and so you have got to build two hundred and twenty-five feet of your tunnel on trestle-work!