(Note: this is all about the explosions reported as the plane hit the North Tower (WTC 1), not about the basement explosions reported later just before the collapse of the tower).
Loose Change claims that the explosions, which occured in the basement levels of WTC 1, were not the result of a jet-fuel-fireball:
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"However, the World Trade Center's core and elevator shafts were hermetically sealed, AKA, air-tight. The fire could not possibly have had enough oxygen to travel 1,300 feet down, retaining enough energy to destroy the bottom 8 floors of the building."
Not only website like Screw Loose Change disagree with this claim.
WTC7.net, a Website which actually debunks the official version regarding the WTC, contradicts the statement made by Loose Change:
A fuel air explosion (FAE) is caused by ignition of a vapour cloud of fuel. In order for the right conditions to exist for a fuel air explosion, there must be the right amount of fuel and the right amount of air. There is a minimum percentage and maximum percentage of fuel/air ratio to achieve such conditions, these are called the lower explosive limit and the upper explosive limit. For jet fuel A, the lower explosive limit is 0.7%, the upper explosive limit is 5%, therefore in order for a fuel air explosion to have occurred in the WTC elevator shafts, there had to have been a mixture of no less then 0.7% fuel, and no more than 5% fuel to air ratio. Any ratio outside of these limits and a fuel air mixture would not ignite. The mistake made in the WTC7.net quote is, they discount the fact that the jet fuel that spilled down elevator shafts could still ignite. The lower and upper explosive limits of jet fuel do not determine whether fuel will burn, rather, they just determine the conditions required for a flammable fuel air mixture. The fuel certainly could ignite, and there are many examples of witnesses describing fireballs in elevator shafts immediately after the strikes on the WTC on the upper levels."Given the quantities of jet fuel involved (10,000 gallons) it is reasonable to expect that large quantities of it, even if vaporized, would not be instantly ignited by the crash because it would be above the mixture's upper explosive limit (ie: too rich to burn). Thus fuel could have spilled down elevator shafts, and ignited only once it had mixed with enough air and encountered a source of ignition at ground level."
See also.
So this reduces the probability of unignited jet-fuel spilling down shafts, but WCT7.net is still right on the fact, that jet-fuel could have spilled down shafts before igniation. But it's misleading in giving a higher amount of presumabely unignited jet-fuel.
However, is Loose Change wrong and debunked? Let's check the facts.
First we have to look into the elevator-system of the Twin Towers to get an understanding of the situation.
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)(NIST NCSTAR 1-1, p.50 - PDF)
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. (Source)
This is confirmed by the blueprint of the WTC, as we can see here that there were only three continuing elevator shafts.Getting thousands of people from the ground level to the offices, observation levels, and restaurants, some as high as a quarter-mile was no small task. Thus, elevators were the primary mode of movement between floors of the World Trade Center. The World Trade Center complex contained more than 240 elevators, with 99 elevators serving the above-ground levels in each of the two main towers and an additional 7 elevators serving primarily the sub-grade basement levels. In the towers, the elevators were arranged to serve the buildings in three sections divided by skylobbies, which served to distribute passengers among express and local elevators. Figure 2-14 shows an elevator riser diagram for WTC 1 and WTC 2 for passenger elevators.
* People traveling to floors 9 through 40 entered a bank of 24 elevators at the Concourse Level. These were divided into four groups, with each stopping at a different set of eight or nine floors (9 through 16, 17 through 24, 25 through 31, and 32 through 40).
* Those going to floors 44 through 74 took one of eight express elevators to the 44th floor skylobby before transferring to one of 24 local elevators, These 24 were stacked on top of the of the lower bank of 24, providing additional transport without increasing the occupied floor space.
* Those going to floors 78 through 107 took one of 10 express elevators from the Concourse Level to the 78th floor before transferring to one of 24 local elevators. These were also stacked on the lower banks of 24.
An occupant traveling to the 91st floor, for example, would have taken an express elevator from the lobby to the 78th floor and then would have had to transfer to another elevator to arrive at the 91st floor. While providing an acceptable rate of people movement, this three tier system also used less of the building footprint than the usual systems in which all elevators run from the entrance to the top of the building. Further, leasable floor space was reclaimed near the top of a given zone. At the top of each elevator bank, the machinery to lift the cabs occupied the next higher floor. From the next higher floor up to the bottom of the next elevator bank, there was no need for an elevator shaft. The concrete floor was extended into this space, providing additional rentable floor are for offices, conference rooms, storage, etc. Fig 2-14, for example, shows that the space taken by Elevator Bank A (Elevators 24 - 29) in order to serve floor 9 to floor 16, was reclaimed for tenant use on floors 19 to 42.
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, 7, 9-40, 44
* Car #6: B1-5, 44, 75, 77-107 (Dual-use express)
* Car #17: B1-1, 41, 43-78
* Car #48: B1-7, 9-40
* Car #49: B1-5, 41-74
* Car # 50: B6 - 108
* Car # 99: 107-116
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.
(NIST NCSTAR 1-7, p.32 - PDF)
Freight elevators Car 50 and Car 6 (dual use), and express elevator Car 7. Here you can see their locations, on the opposite side of the impact (note that elevator Car 6 is labelled as express):

So we conclude from all of the above only one elevator per building had access from the sixth basement level to the 108th floor, and this was Car 50. These would be the “main” freight elevators in each tower.
And we have two elevators serving only particulary floors, beginning from basement level 1, Car 6 and 7. Though their lowest elevator opening was in basement level 1, their shafts went as deep as basement level 4.
This is established due to the blueprints which have been made available through an anonymous source in March 2007. If we look into the blueprints of the core of the sublevels 3-5, we could see that the shafts of Car 6 and 7 ended in sublevel 3, and that the shaft of Car 50 ended not before sublevel 5 (note that the blueprints label the basement floors otherwise than NIST. Service level – B1(NIST), Sub level 1 – B2 (NIST), Sub level 2 – B3 (NIST), Sub level 3 – B4 (NIST), Sub level 4 – B5 (NIST), Sub level 5 – B6 (NIST)).

Above Car 50 in sublevel 5 (B6), and 4 (B5):

Car 6, 7 and 50 in sublevel 3 (Basement 4):

One point should be adressed: due to misleading phrasing in NIST-reports (though NIST makes this false statement so often, that I have problems in believing that this isn't done deliberateley), many people think that there were more than three continuing shafts. Read again from the above NIST-quote:
And here are more:* Those going to floors 44 through 74 took one of eight express elevators to the 44th floor skylobby before transferring to one of 24 local elevators, These 24 were stacked on top of the of the lower bank of 24, providing additional transport without increasing the occupied floor space.
* Those going to floors 78 through 107 took one of 10 express elevators from the Concourse Level to the 78th floor before transferring to one of 24 local elevators. These were also stacked on the lower banks of 24.
This gives the impression that different elevators shared the same shaft, because they were stacked on top of each other to save floor space. Though it does not even seem to be technically possible, people often bring this point in to prove that there were more than three continuing shafts.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. (NIST NCSTAR1-1, Executive Summary XXXVII - PDF)
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. (NIST NCSTAR1-1, p.8 - PDF)
The concept of multiple elevators within a common shaft was first used in the WTC towers and has since become the norm for buildings taller than about 50 stories.
(NIST NCSTAR1-1, p.9 - PDF)
To make an end to this false assumptions, we only have to look at the floor plans.
The key point to observe from what NIST says is, “providing additional transport without increasing floor space”. The elevators were stacked, as in, local elevators would keep the in the same path throughout the building. For example, as per the NIST report, below shows the variations in floor plans as each bank of local elevators terminate, giving the higher levels more floor space.

All four banks occupying floor space.

Bank A terminates, giving these levels more floor space.

Bank B terminates, giving these levels more floor space.

Bank C terminates, giving these levels more floor space.

Here is the 42nd floor upper mechanical room, bank D terminates to allow for the motor to be intalled over the shaft.

Here is the bank D elevator elevation drawing. Note that the shaft terminates and does not continue past the mechanical room. If we look at the top of the drawing we can see that the mechanical room is sealed by the 43rd floor. The drawing shows above this area on the 43rd floor are toilets and a new zone 2 elevator shaft pit. Hence the elevators are stacked.

Here we have the 43rd floor showing the postion of the toilets and the new zone 2 elevator shaft pits.

Here is the 44th floor lobby starting off again. Notice the local elevators are in the same positions, hence they are “stacked”.
So now we have established that there were three shafts which continously run from the impact area of WTC 1 (floors 93-98) down to basement levels. Accordings to NIST:
Here the NIST is wrong on two points. First, as we will see later, Car 50 did not fall all the way to the pit in the sub-basement level. NIST repeatedly made this false statement: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.(NIST NCSTAR1-7, p.160 - PDF)
Second, Car 7 was also in the impact zone and therefore could have fallen all the way down. In theory. In practice, also Car 7 could not have fallen all the way down, like all other elevators. Due to the safety standards, falling elevators would have been stopped by emergency brakes. See this short article from "How stuff works":Two of the interviewee's associates were injured by flying concrete block on the B2 and/or B4 levels when the 50 Car elevator crashed to the bottom of WTC 1. (NIST NCSTAR1-8, p.80 - PDF)
What if you were on an elevator and the cable broke.
So keep this in mind whenever NIST or some eyewitness states that elevators crashed down to the pits, that this is a misinterpretation of what really happened. So in fact, it's not that falling elevators were misinterpreted as explosions, but explosions were misinterpreted as falling elevators. Often this misinterpretation is accompanied by the phrase "what I found out later", or something similiar, of which we will see some examples in the further examination.
Before we look closer into the damage in the basement levels let's see what witnesses have to tell about their experience in Car 50, the main freight elevator.
Arturo Griffith, operated WTC1 elevator Car 50:
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. From this testimony we can rule out the shaft of Car 50 as the possible way for the jet-fuel to cause the reported damage in the basement, as the blast pressure had to go right through the elevator used by Grififth and a co-worker. And they certainly wouldn't have survived it when the pressure from the fireball travelling trough the shaft of Car 50 would be the same force that - as we will see later - caused walls to cave-in, blew out windows, threw people against walls, blew someone’s tongue out of their mouth. From the USA Today article we could not conclude on which floor the elevator stopped. From a CNN report we can assume that it was in a lower level:[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. (USA Today)
Note that he reports three explosions. The first caused the elevator to fall, the second pushed the doors inside and therefore was originating from outside the elevator shaft. And the third pushed him against a wall. From another article we finally could learn on which exact location the elevator stopped:ARTURO GRIFFITH, WTC SURVIVOR: I was running 58 cars -- the elevators that going to 86 to 108th floor.
KING: Where were you when it happened?
A. GRIFFITH: Well, I was on my way from B-2 to 49th floor. And as I took off, it was amount it was a matter of seconds -- five, six, seven seconds, I don't know. And there was a loud explosion and the elevator dropped. And when the elevator dropped there was a lot of debris and cables falling on top of the elevator. And I just -- I just put my hand over my head and I said, oh God I'm going to die. But I didn't know what was happening.
When the elevator finally stopped, they had an explosion that bring the doors inside the elevator, and I think I'm sure that that was what broke my leg. And then they had another explosion and the panel that threw me, you know, against the wall, and I guess I was unconscious for a couple of minutes because somebody else was in the elevator with me, and they say that they was trying to get my attention and they didn't get no response from me. (CNN Transcript)
Note that here it is reported that a fireball came down the shaft after the explosions damaged the elevator and injured Griffith. So this fireball could not be the cause for the explosions and the damage in the basement. This is important as several witnesses describe a fireball coming down and the odor of kerosine. In the official version, these distinguished events are mixed together to deny the possibility of additional explosives.Arturo Griffith was in a freight elevator when the building was attacked. The elevator dropped to B1 (the basement level), fell below the landing. He was trapped in the elevator beneath debris and unconscious. He remembers seeing a beam of light. He called out. The smoke was so thick; Arturo could not see his own hand. So his rescuers had to follow his voice to find him.
'I don't know who saved me. It was so black and smoky. I couldn't see nothin',' Arturo said. 'When they got me out, I told them there was someone else down there, a woman. They went back to get her. Seconds after they pulled her out, a ball of fire came down the shaft. They almost got killed.' (Source)
And regarding elevators 6 and 7, according to NIST they were inoperable on 9/11:
From this statement we can conclude that the elevator cars were parked in Basement 1, where they had their lowest elevator openings. This is also confirmed by NIST:Elevators 6A and 7A were out of service for modernization. (NIST NCSTAR 1-8, p.43)
"The doors were blown off by the fireball that came down the elevator shaft and the elevators cars were burned. (Basement level of WTC 1)." (NIST NCSTAR 1-8, p.43)
































