Intro

This is the second version of the WTC basement level floor plans I made a while back. For full sourcing and other information on the plans themselves please see the first post. For this version I chose to emphasize the elevation differences within the levels.

This should make it more clear how some levels had different elevations, which parts spanned multiple levels, and where ramps go.

High-res (5k) downloads

• Plaza https://ibb.co/spNwjjTh
• Concourse https://ibb.co/FkwcRs7S
• B1 https://ibb.co/SD3NdmPW
• B2 https://ibb.co/zV4gQLfj
• B3 https://ibb.co/FkrDx2vn
• B4 https://ibb.co/Gf4Ww5Pn
• B5 https://ibb.co/Gf4LVrn3
• B6 https://ibb.co/4R2PWjc3

General notes

• This is a 'best effort' attempt prone to error because for most levels, detailed information, especially on elevation, is scarse or absent. I tried to figure out nuances as best as possible, but many assumptions were made, though I will detail these below as well as possible. Things like walls also make it difficult sometimes to really define the border between two elevations. Treat this set as something to give a general impression and not 100% how it was please.
• A legend was added on the left that shows the colour codings that go with each elevation that was drawn in. Numbers are elevations in feet.
• Ramps are especially better noticeable through both added text and arrows, as well as colour gradients which make it very clear whether they go up or down and where.
• For most multilevel rooms or spaces, the colour coding of the floor elevation was used. The only exception to this rule was the heightened ceiling of the Path mezzanine which on B2 was shaded 290/orange to make it more clear the ceiling is at that elevation and it is not an open hole looking down on the mezzanine itself. Bit arbitrary I know.

Level-specific notes

• Plaza and Concourse
  • I've left these untouched because they speak more for themselves, are better known, and simply have few elevation differences that are noteworthy. Also, my personal focus is more on the B1 - B6 levels.
• B1
  • I've put the least effort into this one as the source floor plan is the lowest quality I have. When I get a better version that will be updated
  • Some transitions from the 290 to 294 level for the West loading dock area are not really clear. Per the above points, any ramps can be added in better versions.
  • East loading dock sits inbetween B1 and B2. As I finished B2 first, I copied most of the colouring from B2 east to B1. Bit sloppy in places, sufficient for now.
  • Didn't touch the old Cortlandt subway station which is only visible on B1's floor plan.
• B2
  • By far the best source floor plan so pretty confident about this one, at least the west side.
  • Floor underneath west loading dock on B1 is lowered here as well from 284 to 279.
  • Some ramps and parts of the east loading dock area were, even though the source was extremely high quality, different to read in terms of where exactly elevations and ramps extended to or which wall separated one elevation from another. I've made a best guess here.
  • For Path mezzanine part see General Notes
• B3
  • Added in the Data port level underneath the east loading dock, same as with the v1.2 single colour updated edition.
  • Exact area of the Path mezzanine might be off, but this seemed reasonable.
• Refrigeration room
  • One of few multilevel spaces in the plans, this one goes from B3 all the way down to B6.
  • Ive wrestled a bit with how to colour code this area. From what I can gather, there are to main floors on B4 and B6 which both extend upwards two floors. I chose to colour code them for these two levels, so B4 yellow on B3 and B6 purple on B5.
  • I can see the stairs and galleries and partial openings, but without any further detailed elevation data I felt the single colour approach was best for now. Will update in light of new data.
• B4
  • By far the simplest level as everything except the ramps seem to be on the same elevation.
  • Also here added back in the Data port part from the original source plans. (Also reflected in the updated single coplour versions v1.2)
• B5
  • For both B5 and B6 a large separation in elevation seems to be caused by the Path train station and track areas, which appear to be slightly raised above B6 at 245-ish elevation.
  • I've decided to group the 250-253 elevation in B5 and anything below in B6, which makes sense as the Path patforms at el. 250 are shown on this floor plan.
  • For the Path station/track area, I assumed the very big line drawn along the inside separated the elevations.
  • Assumed the extent of the platforms as best as possible based on information on the map such as the few descriptions on it and things like the locations of stairs and doors.
  • Outside of the platforms I've put the rest of the Path area at elevation 245 as I lack any and all information to make better guesses here.
  • One part that I think is wrong is the elevation inside the WTC 1 and 2 tower area, which might actually be (in part) at the B6 level.
• B6
  • Not much to say here, same approach with the Path area as for B5.

Background

In my personal research into especially the collapse of the towers, the debris, and the state of the WTC compound afterwards, I ran into the issue of no single set of floor plans for the lower levels being readily available.

After a lot of digging I have found reasonable-to-good sources for all floors except for B1, and decided to combine those into one handy set of stackable images. Hope it is of use to someone. Sort of surprised these were so difficult to find.

Result

• Attached the first version of the end result, with colour coded floor plans for each level from Plaza and Concourse down to B6 (sublevel 5). For sources see below.
• All layers have been cleaned, adjusted (rotate/scale/etc), stacked as perfectly as possible, coloured.
• Base layer is a master/site plan slide from the 18324 pdf but with adjustments to some areas particularly involving the sky bridges which had different dimensions in the final construction.
• Images are about 5k, hope Reddit does not downscale
• These are the most basic edited/stacked versions with just colour. Other options will follow, see at the bottom.

Sources

• Base layer/Plaza/ B1/ B4 Mezzazine / B6
  • 18324.pdf (pages262-276)
  • Downloaded from https://pacorpredevblobstorage.blob.core.windows.net/board-documents/uploads/documents/freedom-of-information/foi-fulfilled-requests/18324-WTC.pdf (retrieved 04-2026)
• Concours
  • Downloaded through Reddit from https://imgur.com/W3oCkWD (retrieved 04-2026)
• B3 - B5
  • Base layers downloaded from https://www.911research.wtc7.net/~nin11evi/911research/wtc/evidence/plans/table.html , (retrieved 04-2026)
  • For the B4 Mezzanine area I found the detail a bit too low so I took higher resolution versions from 18324.pdf and pasted those in instead.
• B1 / B2
  • Image posted on Facebook
  • Anonymous

Next steps

I'm working on a number of versions which will be shared separately, including a set in which both the elevation differences on a single level will be more pronounced, as well as clearer view to and from where all ramps go, which can be confusing.

Also in the works the same plans but with the damaged/collapsed areas drawn in to visualize what happened undergound after the collapse. Both of these versions are about half-way through but no idea when I'll have time to finish them. Other options could be colourless or with the background removed.

No idea whether this is useful to anyone, but it felt like a piece of information that was just missing or difficult to find in one place.

If there are specific request feel free to ask but no idea if I'll find the time for them tbh... Any mistakes on my part, please let me know and I'll fix them asap.

Solved/update: The building in the background behind WTC1 remains is the WFC, this photo is taken from between WTC 4 and 5 looking West. The debris on the right appears to be south face of WTC 5 opened up for demolition.

In my personal research I'm documenting a bunch of photos showing the size and location of the debris. But the attached photo I can't seem to pin down.

In terms of location I'm pretty convinced this is Liberty St. looking West. The pile appears to be WTC2. But in front of the tower the street collapsed down which is clear on overhead shots (photo 2).

Yet in this photo that entire 'hole' is not visible, and behind the excavator (though difficult to see) there also is no clear indication of elevation.

So my question: where on Liberty St and at what elevation are this guy and excavator standing?

Are they on ground level? Or standing on B1? Where is the hole?