Multi Story Undergrounds
- Many people report that AT&T underground sites are 1, 2, 3, or 4 stories deep.
(There is a story that the Chatham Site is 13 stories deep). Most of the ones
I have seen up close are 2 main floors with mezzanines much like the Netcong
site, see: http://www1.shore.net/~mfoster/Roxbury.htm
I am sure this would leave the casual visitor to think the building to have
Has anyone ever been in a site that actually had more than 2 main equipment
- A former Dranesville employee told me that site has three floors. The
stairs from the entrance building go down to a blast door on the second
floor; a set of interior stairs leads to the first and third floors.
Also, I think I read somewhere that Finksburg has three floors, but that
might include the mezzanine.
I wonder if the additional floor was used at sites which had some
co-located function requiring substantially more space and personnel than a
regular main station; e.g an AUTOVON operator site.
As for the tales of site with large numbers of floors, I don't believe them
for a couple of reasons.
First, the economics which govern the construction of surface buildings
also apply to underground structures. Given a low cost for land, as would
be the case for the mostly rural/suburban locations of the AT&T sites, it's
generally cheaper to build out horizontally than to go up (or down). In
the case of an underground building, it's probably much quicker to dig a
wide, shallow hole that a narrow, deep one. There's more room to work, and
it's easier to haul the excavated dirt. Also, there's less chance of
hitting rock or groundwater. Similar savings apply to concrete forming and
placement. Since in normal construction practice only one floor can be
poured at a time, fewer floors equals less construction time for a given
total square footage. And then there's the cost of passenger elevators,
which would probably be needed for anything over four floors (especially
the tall floors found in telco facilities).
Similarly, it's easier to lay out and install equipment when all related
items are on the same level. And once the facility is operational, there
are savings from not having to power and maintain elevators.
Second, a multi-story structure doesn't offer much additional bomb-effects
protection relative to a single-level, unless each level is fully isolated
from the others by blast doors, blast valves on HVAC ducts (or separate
ducts systems), and floor-penetration seals. Since the AT&T sites usually
have a single blast door and an internal stairway, the overpressure and
fallout from a breach of any part of the structure would be transmitted to
all the floors.
>Many people report that AT&T underground sites are 1, 2, 3, or 4 storiesdeep.
>(There is a story that the Chatham Site is 13 stories deep). Most of theones
>I have seen up close are 2 main floors with mezzanines much like theNetcong
>site, see: http://www1.shore.net/~mfoster/Roxbury.htmhave
>I am sure this would leave the casual visitor to think the building to
>Has anyone ever been in a site that actually had more than 2 main