The METRO Tunnel Project
This is the beginnings of the Convention Center Station and bus staging yard.
This steel structure was dropped into a hole vertically, and the hole then filled with concrete.
Another similar structure was placed and filled next to it,
and another next to that to build a wall of columns
that would be the structure that would keep Pine Street in place
as the hole for the staging area was dug.
Photograph by K. L. Slusher