Not much in the way of soot and heat damage. This is the bomb that people believe was UNDERNEATH the train. This is consistent with the intense white heat "flash" being absorbed and "deflected" by the floor of the train. A VERY compelling peice of evidence.
More what you would expect to find with a blast originating INSIDE of the train between London's Kings Cross and Russell Square Underground stations, where 27 people were killed.
This is the Edgware Road Underground station bomb and appears NOT to have originated from underneath the train. However...note that "cross beam" running left to right...it has a nice "chunk" missing out of it. Also, is the carpet hiding "upturned" metal? Actually, i'm going to claim it was possibly underneath and attached to that cross member. The fact that a "chunk" is missing from it suggests an explosive device was directly attached to it. It is EXTREMELY unlikely that a bomb directly above it could penetrate the floor and take that "chunk" out.
Also, check out that carpet and compare it to the wall behind it. Note the heat damage the wall has absorbed and then look at the carpet? The explosive device was strapped to the "wall" side of that crossmember and the heat blast was directed "up" and "back" against the wall.
That is my "amature explosive knowledge" belief. In fact i'll ever wager it.
The witness statement that claimed the hole appeared to have been caused by a bomb "underneath" the train was "London's Aldgate East station." See top photo.
Thanx for the links IGWT.
"Experts" conclude the devices were "powerful". Really? And to cover their ass, are trying to say it was a VERY powerful "home made" bomb that contains "Triacetonetriperoxide" (TATP). The best info on this sort of bomb comes from...Technion-Israel Institute of Technology.
Here is the part article from Janes Defence Weekly.
TIC Briefing: Terrorist use of TATP explosive
By Richard Evans
Preliminary forensic testing of materials in a house in Leeds, UK, and the scenes of the 7 July terrorist attacks in London have identified traces of Triacetonetriperoxide (TATP), a powerful home-made explosive.
Further testing by explosives forensic experts will still be necessary to confirm the presence of TATP, along with any other explosive produced at that address. If any chemical slurry left over from the production process can be detected, then this too will be subject to analysis.
The terrorists’ use of TATP may reflect an awareness of the UK counterterrorism security environment, where any attempt to acquire commercial or military grade explosives is likely to quickly bring a terrorist network to the attention of authorities. A decision to use TATP, which is composed of relatively small quantities of materials widely available on the open market, would have helped to reduce the likelihood of detection by security forces during the logistics phase of the operation.
Triacetonetriperoxide (TATP) is a highly volatile, highly explosive compound made from widely available chemicals, including acetone, hydrogen peroxide and a mineral acid.
Accurate information on the properties of TATP is difficult to locate in open sources, possibly due to concern about its potential use in construction of terrorist IEDs; what material does exist in the public domain is often contradictory and confusing. Explosives such as TNT explode following an input of energy, for example heat or shock. This causes the explosive molecule to break up, the fragments then combining to release energy in the form of heat and light. The difference in energy between the original molecule and its products thus defines the energy liberated from the explosion. However, according to researchers at the Technion-Israel Institute of Technology, TATP does not react in this way; rather, it explodes by the breaking of each solid TATP molecule to form four molecules of gas (ozone and acetone), without the products reacting with each other. The evolved gas now occupies the volume originally occupied by the solid explosive, but at much higher pressure. The gases expand outwards, causing a shockwave in the air and accelerating the surrounding material to high velocities. The work done by the detonation of TATP is about 80 per cent that of TNT, its detonation velocity being about 5250 m/s.