Big Pipe in Ground Zero

[sweetwater]

So many denied I had seen this 40+ years ago. I specifically remember what was a subway tunnel instead looked only like a pipe suspended on stilts with steam shovels working beneath.

Ah, so that's what is meant by 'pipe dream'.
And no worries, ghosts are still at the WTC site. I saw a photograph taken after the towers were detroyed that showed the buildings' 'ghosts' still in place, so perhaps the tunnel has a ghost remaining, too.