The jury in the July 21 terror trial heard that the bombs would have caused carnage had they exploded as intended on London's transport system.
It was only a combination of bad science, luck and miscalculations by the bombers that stopped them going off.
The jury on Monday unanimously found Muktar Said Ibrahim, 29; Yassin Omar, 26; Ramzi Mohammed, 25; and Hussain Osman, 28, guilty of conspiracy to murder. Sentencing is scheduled for today.
According to a government forensic scientist, Claire McGavigan, the bombs could have sent lethal shrapnel traveling at "hundreds of meters a second."
The bombs were made of high-strength hydrogen peroxide mixed with chapati flour in the kitchen of Yassin Omar's apartment in north London, the court heard.
McGavigan, a leading explosives expert in the UK, told the court the devices were new to her but they were as powerful as high explosives, such as gelignite and TNT.
"Before July 2005 we had never had this type of material submitted to our laboratory," she said.
The main charge was a secondary high explosive of equivalent strength to gelignite and that the devastating effects of the devices would have been made only worse by screws and tacks taped to the outside -- "embedding" themselves into the skin of anyone nearby.
"There would be serious damage to the train itself, there would also be serious injuries, quite possibly death to people in the area at the time," she told the court.
"If they did not suffer death, serious injuries such as injuries to internal organs, loss of limbs, effects on your hearing -- very serious injuries indeed," she said.
McGavigan was asked why the main charge had not gone off when the bombs were detonated.
"The most likely reason for this was that the initiator [detonator] ... wasn't actually powerful enough to set off the main charge," she answered.
Mukhtar Ibrahim's counsel, George Carter-Stephenson, told the court: "The positive case is that all the devices were constructed in the same way, Mr Ibrahim being principally responsible for their construction."
The court also heard that Ibrahim's aim was to cause an attack bigger than the July 7 attacks in London that killed 52 people.
Meanwhile, the jury that convicted the four men of plotting the attack was dismissed yesterday after failing to reach a verdict against two other defendants.
Judge Adrian Fulford gave prosecutors until this morning to say whether they would seek a retrial of Asiedu and Yahya.
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