POTUS saying 1917 again ;)
What isn't clear is if that tunnel has been out of service since. With the references to 1917 and to tunnels, this seems to me to be worth looking at. The article did say it was 20 stories below the city.
The other thing that continues to come to mind is DJT's background in NYC real estate. He must know the city like the back of his hand. And he would know of any below ground structures, lines, tunnels that would impact potential construction above.
Are you getting any vibes about 1917?
Q had 4 posts that I can see so far. Still digging.