I believe the reader will find that the following information proves without a doubt that terrorists used an explosive device in the subleves of the North Tower.

The Case for an Explosive Device In The Sublevels of the WTC North Tower
Author: Swing Dangler

I will not attempt the blame game with this premise. I am not a structural engineer or an explosives expert. I do have reasonable doubts about the official story. My research to this point on a personal level has been with a trained explosive expert in the U.S. military and with a construction engineer. I have read reports in support of the NIST and rebuttals to the NIST report. I have also read the NIST report summary as posted online. The reason for this hypothesis is to consider what assisted in the global collapse of the Twin Towers. The existence for this hypothesis is three-fold.

1. The NIST did not attempt to explain the reason for a global collapse nor consider the hypothesis which I proposed. Does that make the existence of explosive devices(ED) invalid? No.

2. NIST provided no evidence to support their view that the collapse of upper floors led to a progressive collapse or more importantly a global collapse.

3. The NIST made a conscience decision not to test for explosive residue at the WTC complex despite the overwhelming evidence that something occurred in the sublevels of WTC North Tower. This would have proven one way or another whether an explosive device was used in the sublevels of the North Tower.

I would argue that the historical record would be one reason to explore the ED hypothesis. I'm sure you are all aware of the 1993 WTC attack using a truck bomb in the subbasement at the WTC. If terrorists could use this tactic once, isn’t it reasonable to suggest thy might try that tactic again, especially when combined with the use of planes? The reasonable person would think so.

Please do not confuse explosive devices with controlled demolition. As Implosion World stated the collapses did not have the same characteristics of a traditional controlled demolition. With that issue, I do agree to a point. The collapse did not start at the bottom as per a traditional demolition but the attack of the structure did begin in the sublevels and centered around the core where the elevator shafts were located.

My first piece of evidence for arguing for an explosive device is the logical sequence of events that followed the explosive sound. Numerous things can sound like explosions. I do not dispute this. However, it is the reaction and change of the surroundings, the impact on people, and their reactions and thoughts following the sound of the explosions which points to a device in the sublevels.

In the following victim accounts, the sequence of events follows:
The sound of an explosion is heard, people react to the sound or suffer injuries from the device that caused the sound, and then finally the change in the environment is described by the event producing the sound.

Numerous witnesses in the sublevels have stated on record regarding the damage in the substructure of WTC-North Tower. To avoid the accusation of cherry picking or quote mining I have provided the relevant link after each account. Also with each witness I have tried to use their words verbatim in the description of events that they experienced.

The conclusion of the paper will show that it is impossible for a fuel air explosive from the first impact of the plane to have caused the type of personal and structural damage experienced and reported. Bsbray of studyof911.com has provided an excellent analysis refuting the fireball theory so I have no intention of reinventing the wheel.

A. Employees of WTC-North Tower

1.Mike Pecoraro, Stationary Engineer and unnamed Co-Worker
a) Sees 'lights flicker, the Asst. Engineer reports to him hearing a large
explosion,
b) Sees white smoke, and reports the smell of kerosene.
c) The smell he thought coming from perhaps a burning car in the parking
garage above them.
d) Kerosene smell, not a kerosene fire. Burning Kerosene does not produce white smoke.
e) Damage after the sound of an explosion: When the two arrived at the C
level, they found the machine shop gone.
"There was nothing there but rubble, "Mike said. "We're talking about a 50
ton hydraulic press ? gone!"
f) A machine shot and a 50 ton press is gone.
e) Location of damage-C-level
f) The two made their way to the parking garage, but found that it, too, was
gone. "There were no walls, there was rubble on the floor, and you can't
see anything" he said.
g) Parking garage and walls are gone.
h) As they ascended to the B Level they were astonished to
see a steel and concrete fire door that weighed about 300 pounds, wrinkled
up "like a piece of aluminum foil" and lying on the floor.
i) Comments, "They got us again referring to the WTC 93 bombing. He saw
similar things after that bombing.
j) He was convinced a bomb had went off in the building.
k) Observes two victims, badly burned an injured.
l ) No reports of black soot in the lobby

Brief summary of experience: explosive sound heard, followed by white smoke
with massive damage on multiple floors, and burned and injured victims.
Source: Chief Engineer:http://www.chiefengineer.org/article.cfm?seqnum1=1029

2. Jose Sanchez, Maintience Worker & co-worker, Chino
a) Hears the sound of an explosion,” It sounded like a bomb went off."
b) Sees lights flicker.
c) Located in Sublevel 4 workshop.
d) Fireball in the freight elevator.
e) Singes hair and drops co-worker Chino to his knees.
f) Room fills with smoke, "I believe it was a bomb that blew up inside the
building."
g) Chino's leg and knee apparently broken. He can't walk and gets assistance
from Sanchez.
h) Fireballs do not break legs, however, concussion force can and does.
i) Exits at parking level lot on sub level 4 and sees many people fleeing.
j)"It took about 15 or 20 minutes to get outside and for me it was like a bomb
with huge smoke all around.”
i) Comments he is lucky to be alive because he wasn't near the stairwell.
Brief Summary: sound of an explosion, damage to freight elevator, damage to humans
Source: Taped statement to William Rodriguez as reported in the Arctic Beacon’s Second Janitor story.

3. Phillip Morelli, construction worker, 7 year employee at WTC 1
a) Location-4th sublevel, B-4 main freight car
b) "That is when I got blown. The impact of the explosion or whatever happened
threw me to the floor. And that’s when everything started happenin'.
It knocked me right to the floor. You didn't know what it was, you just
assumed something fell over in the loading dock. Something very heavy,
something very big. You don't know what happened then all the sudden you
just felt the floor movin' and you get up... the walls, you know now I'm
hearing that the main freight car, the elevators, you know what I mean fell
down so I was right near the main freight car so I assumed what that was.
Then you heard that comin' towards ya. I was racing I was goin' towards the
bathroom, all of the sudden I opened the door i didn't know it was the
bathroom and then the big impact happened again and then all the
ceiling tiles started falling down the light fixtures were falling swinging,
swinging out of the ceiling. I came runnin' out of the door and everything,
the walls were down and I started runnin' towards the parkin' lots."
c) Nearly 100 floors below where the first plane hit.
d) Thought a car or something exploded on B-1 or something big and heavy got
delivered and fell over.
e) Knew it was something big floor was moving underneath him
f) Reports smoke and people screaming
g) Got to parking lot and describes a lot of smoke, people screaming, and
helping a person with a broken leg.
h) He and others run up the ramp from 1 to 2, as you have to do that to get out
of the subbasement, it happens all over again. And got thrown to the floor.
But unaware of a second plane hit.
i) Walls in the basement caving in
j) Knows people got killed, broken legs, and reconstructive surgery because the
walls hit them in the face.
k) No matter where you were in the building, you weren't safe.
l) Reports no fireball as the official story proposes.
Brief Summary: Explosion throws him to the ground and causes the floor to move underneath him. The explosion destroys walls and a freight elevator that he was near. He runs to the bathroom and another explosion causes damage to the ceiling and lights, injured people are seen in parking garage, he attempts to escape by going to Tower 2 exit and gets thrown to the ground for a second time.
Source-NY1 News http://www.ny1.com/pages/RRR/911special_survivors.html

4. Marlene Cruz, Carpenter, employee for 15 years
a) Location: elevator subbasement B, WTC 1
b) Hears an explosion that blows up the elevator, the elevator falls, and gets
stuck at B level.
c) Herself and the elevator operator are injured.
d) She reports her body felt like it was run over by a truck and has a
sprained leg.
e) After hearing the explosion she states, "Here we go again another bomb" in
reference to her experience with the 1993 truck bombing.
f) States seeing her friend Arther Delbeanko (sp?) who was fine after she go
hurt. They hear screams. He was going around looking for other people,
trying to break through doors to see who he found.
g) She states Arthur got hurt after her. No description is given how he was hurt after

Brief Summary: Hears an explosion, elevator is blown up, stops at B-1 Marlene
and the elevator worker suffer injuries. She gives NO mention of burns from a
fire. She mentions no smoke or fire at all from fuel air explosive.
The explosion reminds her of the 1993 truck bomb and she thinks it is another
bomb.
Source: ABC News Special Report with Peter Jennings www.youtube.com/watch?v=TSGZYP--wz0 - 99k

5. Felipe David, employee of Aramark Co.
a. Location-office sub level 1
b. Explosion heard below sub level 1.
c. The building started shaking.
d. Dust was flying everywhere.
e. It got real hot.
f. Reports feeling burned.
g. “I threw myself onto the floor, covered my face because I felt like I was
burned."
h. "I sat there for a couple of seconds on the floor and felt like I was
going to die, saying to myself ‘God, please give me strength.”
i. Severely burned on his face, arms and hands with skin hanging from his
body.
j. Reports to several others in an office that there was an explosion.
k. Other state that it is good he is alive despite his appearance.
Brief Summary: Explosion heard below him, feels heat and is burned severally, and reports an explosion. They is the event that caused personal damage was below him.
Source: Colombia television programming in Spanish on the Red Continental
De Noticias (RNC) with Gurisatti a Colombian reporter as a part of
an in-depth 9/11 documentary after the foreign station spent a month
in New York in 2002 shooting the project.

6. Salvatore Giambanco, a WTC office painter, just getting off of an elevator
a. Location, sub-level 1 opposite side of Felipe David.
b. Hears an explosion, reports smoke came from all over.
c. "An incredible force of wind swept everything away."
d. Standing with another man, he hears a screaming woman
e. As a reaction to the wind, Salavatore and the unidentified man jump back
into the elevator.
f. The elevator descends to between sub-level B-2 and B-3.
g. Witnesses other people through the slot running and screaming.
h. Water begins to enter the elevator from apparently the sprinkler system.
i. Salvatore begins to fear for his life and is screaming.
j. "God, please help us.’ At that point, I was resigned to the fact I was going to die”
k. Hears William Rodriguez ask, "How many people are down there?"
l. Rodriguez rescues the two men.
m. Rides in an ambulance to the hospital.
n. “I remember riding in the ambulance that morning and looking back, thinking
it had to be a bomb."
o. Upon learning an airplane had hit the tower: “Later they told me it was an
airplane that hit the towers, but how could it just be an airplane? I know
all the newspapers were saying that, but it was just too incredible to
believe if you heard and experienced what I did. It had to be a bomb.”
Brief Summary: He hears an explosion, reacts to the environmental impact of the explosion, and believes it was a bomb.
Source: Colombia television programming in Spanish on the Red Continental
De Noticias (RNC) with Gurisatti a Colombian reporter as a part of
an indepth 9/11 documentary after the foreign station spent a month
in New York in 2002 shooting the project.

B. Police, Port Authority, etc. Transcripts

1. Unidentified Male Caller to Port Authority Police Department-
a. Location-Turner Construction right outside the 50 car, across the hall from 50
car.
b. “Officer, help.” We’re down on the B-4 level. There’s been a big explosion.
We’ve got water lines open. There seems to be smoke and steam in the area.”
c. The caller goes on to report “smoke but unsure whether it is from fire or dust”
with “broken water lines and water all over”.
Source: http://www.thememoryhole.org/911/pa-transcripts/pa-transcript036.pdf

2. Male Caller on Portable Device call to PAPD Officer Brady
a. Location- B-1 level
b. “We had a ….minor explosion (inaudible). Or a major explosion.
Source: http://www.thememoryhole.org/911/pa-transcripts/pa-transcript010.pdf

3. Male Caller on Radio Channel W to Police I (it appears to be the same caller as
above but recorded on a different channel)
a. Location-B-1 level, One World Trade Center
b. “(inaudible) B-1, level , One World Trade Center. It’s (inaudible), we had a minor
explosion or a major explosion, something happened down here.”
Source: http://www.thememoryhole.org/911/pa-transcripts/pa-transcript047.pdf

4. Male Caller Recorded on Radio Channel X-Security
a. Location-B-2 between red and yellow lots
b. ASAP, six-three, be advised, I have to ABM workers down here on B2 ah between
the red and yellow lots. Be advised I’ve got two ABM workers hurt.”
c. “I need an ER ESP down here ASAP!”
d. After being asked where he needs assistance, the caller responds.
e. B2 between the red lot and the yellow lot, the walkway where the ABM office is.
Source: http://www.thememoryhole.org/911/pa-transcripts/pa-transcript048.pdf

5. PAPD Officer 33 responding to a Cave in at B-4
a. Traveling to sub-level B-4, WTC North Tower
b. “Myself and (inaudible) to the Trade Center responding with scott packs to the B-4
Level. There’s a report of a cave-in and people trapped.”
c. PAPD Desk-“Roger, three three and eight-two Houston, World Trade responding
B-4 level on a report of a cave in.
d. Officer 33- “There’s also been a cave-in at the platform of the PATH
plaza…there’s a live electrical, and water running. Turn off the power in that area.
e. PAPD Desk reports to other responders-“Three-three is reporting that there is a
cave in, B-4 level, at the World Trade Center, copy? A possibility of people trapped.
Source: www.thememoryhole.org/911/pa-transcripts/pa-transcript010.pdf

6. Male caller to 310B Fire Command Radio Channel X-Security
a. Location-Path Train
b. “Please let me get through! The PATH train, something is going on at the PATH
train! Can you ask somebody to make an announcement, 310B, people are running
out of the PATH train, copy!
c. Male-“Ten-four. (Inaudible) to 63.” Female-“Yes.
d. Male-“See if you can make an announcement with PAPD with regards to people
panicking in the PATH trains! Female-“That’s people by the PATH train, copy.”
e. Note: Whatever caused the explosion apparently caused the cave in/partial collapse at
B-4 basement level, even to the point of causing people to panic and get off the
train, resulting in the phone calls from PAPD 33 and a call to 310B Fire command.
Source: http://www.thememoryhole.org/911/pa-transcripts/pa-transcript048.pdf

Many of the communication transcripts above follow a similar patter of an explosion heard or reported, human injury is then reported, and finally the damage to the structure is described. The most significant damage to the structure being a cave-in at B-4 that caused the people on the PATH trains to panic and flee.

It is impossible for the excuse the official story holds that a fire ball traveled down the towers into the subbasement levels, particularly sublevel 4, as the analysis will show below.

In conclusion, aside from actually testing for explosive residue which no Federal Agency did, the above accounts and the analysis below conclusively prove that an explosive device was used in the sublevel structure of World Trade Center, North Tower. The purpose of the device is pure speculation. Was it used to destroy the elevators thereby increasing the difficulty in rescue? Could it have been a “divide and conquer” tactic used to hamper firefighter’s responses by sending teams to the basements and to the point of impact? Or was it used to weaken and damage the strongest portion of the building, the 47 core columns that were anchored to the ground? As any demolition expert will tell you, if you want to assist in bringing a building down, you have to weaken or destroy its base.

The reader is left to hypothesis why FEMA, NIST, and the 9/11 Commission choose to ignore the evidence of an explosive device used in the subbasement of the North Tower.

WTC1’s Main Freight Shaft Was
Not Rocked to the Basement by an FAE!
First, let us establish that there was only one elevator per building with access from the basement levels all the way up to the 108th floor.
From NIST NCSTAR 1-1, Design, Construction, and Maintenance of Structural and Life Safety Systems, page xxxvii (page 39 of the PDF file), emphasis added:
Elevators were the primary mode of routine ingress and egress from the towers for tens of thousands of people daily. In order to minimize the total floor space needed for elevators, each tower was divided vertically into three zones by skylobbies, which served to distribute passengers among express and local elevators. In this way, the local elevators within a zone were placed on top of one another within a common shaft. Local elevators serving the lower portion of a zone were terminated to return to the space occupied by those shafts to leasable tenant space. People transferred from express elevators to local elevators at the skylobbies which were located on the 44th and 78th floors in both towers. Each tower had 99 passenger and 7 freight elevators, all located within the core of the building.
From the same document, page xlviii (page 50 of the PDF file), emphasis added:
There were 99 passenger elevators in each tower, arranged in three vertical zones to move occupants in stages to skylobbies on the 44th and 78th floors. These were arranged as express (generally larger cars that moved at higher speeds) and local elevators in an innovative system first introduced in WTC 1 and WTC 2. There were 8 express elevators from the concourse to the 44th floor and 10 express elevators from the concourse to the 78th floor as well as 24 local elevators per zone, which served groups of floors in those zones. There were seven freight elevators, only one of which served all floors. All elevators had been upgraded to incorporate firefighter emergency operation per American Society of Mechanical Engineers (ASME) A17.1 and Local Law 5 (1973).
From an online reproduction of a 1967 Otis Bulletin article from the Otis Elevator Company, the company contracted to install all of the WTC Tower elevators in 1967:
In addition to normal freight service one freight elevator in each of the towers will serve a total of 112 stops from the fifth basement to the 108th floor. It will rise 1,387 feet (422.8 meters) – 400 feet (122 meters) more than the former record rise in the Empire State Building.
And finally, from NIST NCSTAR 1-7, Occupant Behavior, Egress, and Emergency Communications, page 34 (page 72 of the PDF file):
In addition to the passenger elevators, there were seven freight elevators in each tower; most served a particular zone, while Car 50 served every floor.
So we conclude from all of the above only one elevator per building had access from the fifth basement level to the 108th floor, and this was Car 50. These would be the “main” freight elevators in each tower.
USA Today published an article by Gregg Zoroya titled “The Griffiths”, the online version of which was last updated September 10th, 2002, on two survivors of the WTC disaster in New York. The two survivors were husband and wife, and were also both elevator operators for the North Tower, WTC1, the same building relevant in the testimonies of Lt. Walsh, Phillip Morelli, William Rodriguez, and Mike Pecoraro.
The husband, Arturo Griffith, operated WTC1 elevator Car 50, which USA Today further describes as, “the big freight car going from the six-level basement to the 108th floor.”
[The Griffiths] were both operating elevators in the north tower on Sept. 11. Arturo was running 50A, the big freight car going from the six-level basement to the 108th floor. When American Airlines Flight 11 struck at 8:46 a.m., Arturo and a co-worker were heading from the second-level basement to the 49th floor.
Like his wife, who had just closed the doors on a passenger elevator leaving the 78th floor, Arturo heard a sudden whistling sound and the impact. Cables were severed and Arturo's car plunged into free fall.
"The only thing I remember saying was 'Oh, God, Oh, God, I'm going to die,' " he says, recalling how he tried to protect his head as the car plummeted.
The emergency brakes caught after 15 or 16 floors. The imploding elevator door crushed Arturo's right knee and broke the tibia below it. His passenger escaped injury.
There is a one-story discrepancy of this elevator’s range with Otis Elevator Company’s 1967 Bulletin article (six vs. five accessible basement levels), but it remains clear that the main freight elevator is indeed the elevator relevant to this article.
Though the door to Mr. Griffith’s elevator was knocked out when the safety brakes caught the free-falling elevator, there was no fuel-air explosion (FAE) down this elevator shaft. Remember that such an event is hypothesized to have not only traveled hundreds of feet down this elevator shaft into the basement, but to have also caused major destruction in the basement levels of WTC1 as reported by Rodriguez, Pecoraro, Morelli, and their co-workers, including a destroyed basement machine shop, and blown-out, lower-level elevators accessing the lobby.
This contrasts with the account of Mr. Griffith’s wife, Carmen:
A full elevator had just left the 78th floor, and Carmen was about to carry up six or seven stragglers. The plane struck as the doors of her elevator closed. They could hear debris smash into the top of the car; then the elevator cracked open, and flames poured in. Carmen jammed her fingers between the closed doors, pulled them partly open and held them as passengers clambered over and under her 5-foot-6 frame to escape.
Before finally throwing herself out onto the lobby floor, she glanced back to be sure the elevator was empty. That was when fire scorched her face with second- and third-degree burns, and literally welded her hooped right earring to her neck. Her hands were badly burned.
Note that Mrs. Griffith was not on the elevator that had access to the basement levels. Also note that, though she was burned, there was not a blast characteristic of an explosion that would cause such destruction as what was witnessed in the WTC1 basements, or else Mrs. Griffith surely would not have survived.

Car 6
The following excerpt comes again from NIST NCSTAR 1-7, page 34 (page 72 of the PDF file).
In addition to the passenger elevators, there were seven freight elevators in each tower; most served a particular zone, while Car 50 served every floor.
• Car #5: B1-5, 6, 9-40, 44
• Car #6: B1-5, 44, 75, 77-107 (Dual-use express, see below)
[…]
There were two express elevators (#6 and #7) to Windows on the World (and related conference rooms and banquet facilities) in WTC 1 and two to the observation deck in WTC 2. There were five local elevators in each building: three that brought people from the subterranean levels to the lobby, one that ran between floors 106 and 110, and one that ran between floors 43 and 44, serving the cafeteria from the skylobby. All elevators had been upgraded to incorporate firefighter emergency operation requirements.
So we see that another elevator, Car 6, ran from the impacted floors of WTC1 to sublevel B1, but no further.
From page 122 of the same document (page 160 of the PDF file):
For an elevator’s cables to be cut and result in dropping the car to the bottom of the shaft, the cables would need to have been in the aircraft impact debris path, floors 93 through 98 in WTC 1 or floors 78 through 83 in WTC 2. Inspection of the elevator riser diagram and architectural floor plans for WTC 1 shows that the following elevators met these criteria: cars 81 through 86 (Bank B) and 87 through 92 (Bank C), local cars in Zone III; car 50, the freight elevator, and car 6, the Zone III shuttle. … Cars 6 and 50 could have fallen all the way to the pit in the sub-basement level, and car 50 in WTC 1 was reported to have done so.
Here, NIST states explicitly that elevator Car 6, along with Car 50, were the sole elevators of WTC1 with access to the basements from the impacted floors of WTC1. And as noted in the previous excerpt from NCSTAR 1-7, Car 6 only reached sublevel B1, the uppermost basement level, while explosions and other destructive events were observed on B1 as well as below B1, on B2 and possibly lower (see the above testimonies of Rodriguez and Pecoraro).
Conclusions
All of the above information should bring us to the logical conclusion that a fuel-air explosion did not travel hundreds of feet down the main freight elevator shaft of WTC1, from the impacted floors to the basements, to cause structural damage to the basement floors and lobby. Car 50 was the only elevator with access from the impacted floors of WTC1 to the sublevels B2 and below, and its operator survived, having experienced no explosions or fireballs down the main freight shaft.
That such a fireball could have traveled down Car 6 has not specifically been ruled out by the above information, but it could not have extended beyond sublevel B1, whereas explosive events caused much destruction on lower floors.
Also, considering an FAE traveling down this shaft sufficient in strength to destroy a machine shop in the basement levels (as per Pecoraro’s testimony), even if this elevator had access to this floor, and cause elevators servicing the lowest floors to blow out (as per Walsh’s testimony), as well as additional structure damage in the basements, it seems extremely unlikely, if not impossible, that the shaft itself, and neighboring floors all the way down would not be similarly destroyed by the massive overpressures accompanying this FAE down the building. Put simply, an FAE moving down an elevator shaft and causing severe damage in basement levels with massive force, could also be expected to destroy the shaft itself, especially since this shaft would be a very confined area, and its wall supposedly not reinforced by any concrete in the walls or etc.
The visible fuel-air explosions caused by the impacts visibly failed to destroy even the outer perimeter columns of the impacted floors, or to even remove their aluminum cladding, which was only fastened on and not solidly connected. Only the plane impacts themselves severed perimeter columns or caused such damage to the aluminum cladding. There is no evidence of great overpressures from the fireball itself if it traveled down the shafts either in the interior or exterior.
How, then, could a fireball that failed to remove this aluminum cladding in its immediate blast, travel down over a thousand feet of an unprotected elevator shaft and maintain sufficient overpressures to shatter concrete and steel fire doors, and cause a cave in at level B-4?
It has already been shown that the operator of elevator 50, the main freight, did not even experience a fireball, let alone life-threatening overpressures. This fits logically with the lack of exterior damage shown above.
More realistic explanations of the WTC1 basement events, including the use of secondary explosive devices, should be considered.
[10] This document is hosted by NIST at http://wtc.nist.gov/NISTNCSTAR1-1.pdf. Alternately, a cache of the document is hosted at Studyof911.com at http://www.studyof911.com/cached/NIST/NISTNCSTAR1-1.pdf.
This page can be found at http://www.otis.com/otis150/section/1,2344,ARC2495_CLI41_RES1_SEC5,00.html. A cache is hosted at Studyof911.com at http://www.studyof911.com/cached/1,2344,ARC2495_CLI41_RES1_SEC5,00.html.
This documented is hosted by NIST at http://wtc.nist.gov/NISTNCSTAR1-7.pdf. A cache of this document is hosted at Studyof911.com at http://www.studyof911.com/cached/NIST/NISTNCSTAR1-7.pdf.
This page can be found at http://www.usatoday.com/life/sept11/2002-09-10-surivivor-griffiths_x.htm. A cache is hosted at Studyof911.com at http://www.studyof911.com/cached/2002-09-10-surivivor-griffiths_x.htm.
Source: “bsbray” of Studyof911.com, Oct. 31, 2006. Last updated Feb. 17, 2007 (added photos and more technical data). Drawn heavily from the research of AboveTopSecret.com forum member “Valhall”, with additional helpful feedback from “ashmok” of the same forums (Thanks, you two!).