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 Newly-released images show more than 20 bombs in the booby-trapped apartment of Aurora theater shooter James Holmes, who was sentenced last month to life behind bars. 
 
 The 27-year-old used soda bottles and wires to rig his apartment with home-made explosives and incendiaries that had to be made safe by experts with the help of a robot. 
 
 The scene inside the booby-trapped home of James Holmes. Aurora Police Department 
 
 Buildings surrounding his suburban Denver apartment had to be evacuated in the hours after the July 21, 2012 shootings in which he opened fire during a midnight screening of Batman film "The Dark Knight Rises," killing 12 people. 
 
 Holmes was formally sentenced on Aug. 27 to one life term in jail for each victim, plus 3,318 years for the attempted murder of dozens of others. He was convicted after the trial judge rejected his insanity plea. 
 
 With the trial over, prosecutors released some of the evidence including photos that showed how the apartment was to kill by exploding and catching fire. 
 
 Related: Survivors, Loved Ones Welcome James Holmes Convictions 
 
 A robot entered the apartment, but some of the devices had to be taken apart by hand. 
 
 An image from inside James Holmes' apartment. Aurora Police Department 
 
 Gary Smith, an Army veteran and explosives expert with the Bureau of Alcohol Tobacco Firearms and Explosives, told KUSA that his team took the task of securing Holmes' apartment in their stride. 
 
 "No, I really wasn't too scared," he said. "It doesn't surprise me to run across anything anywhere really. It's just a matter of time before something like that ends up here, kind of the way we look at it, kind of worst case scenario, you always try to think ahead." 
 
 Some of the images were taken from the robot's camera. 
 
 During the trial, it emerged that Holmes had considered killing people since he was a teenager. ||||| Newly released video shows the moment a bomb squad robot entered the apartment of Aurora, Colorado, theater gunman James Holmes, which was booby-trapped with over 20 bombs and incendiaries. 
 
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 After Holmes was apprehended behind the theater, where he opened fire three years ago during a midnight screening of the Batman film "The Dark Knight Rises," he told police about his booby-trapped apartment, according to Richard Orman, a senior deputy district attorney for the 18th Judicial District of Colorado. 
 
 Five buildings surrounding Holmes' residence were then evacuated, and a remotely controlled Adams County Bomb Squad robot was sent into Holmes' apartment early in the morning of July 21, 2012, just a few hours after the shooting, Orman told ABC News. 
 
 The Explosives and Incendiaries the Robot Found Upon Entry: 
 
 The first thing you can see in the newly released video obtained by ABC News is white powder and discolorations scattered across the apartment's floor – gun powder and gasoline and motor oil, respectively, according to a newly released, 62-page FBI report obtained by ABC News that details the explosives. 
 
 A closer look from the bomb squad's robot camera also revealed dozens of black spheres with fuses all connected to each other and to pickle jars with liquid and bullets inside of them. 
 
 Courtesy District Attorney’s Office for the 18th Judicial District of Colorado 
 
 The 16 black spheres contained smokeless powder and gasoline, while pickle jars connected to the spheres were layered with thermite, which creates high-temperature fires, in addition to bullets and napalm. 
 
 A few 2-liter soda bottles in the back of the apartment also contained more gasoline. 
 
 The Booby Traps Holmes Set Up to Trigger an Explosion: 
 
 The first booby trap was a trip-wire made of a fishing line with one end connected to the door jam and the other connected to a thermos, Orman said. The thermos had a bottle of nearly pure glycerin perched precariously on a frying pan that contained the chemical potassium permanganate. 
 
 If the glycerin had fallen in, a huge flame would've ignited, "blowing up the whole apartment," Osman said. 
 
 He added that Holmes set up a recording with 40 minutes of silence, followed by loud music in what he believed was an attempt to get someone to open the door and set off the trap wire. 
 
 Courtesy District Attorney’s Office for the 18th Judicial District of Colorado 
 
 Holmes' downstairs neighbor Kaitlyn Fonzi testified in May she was drawn to the apartment around midnight by the music, and though she knocked, no one answered so she left. 
 
 Two other booby traps involving remote-controlled pyrotechnic systems were also set up by Holmes, including a button set up inside the apartment and a remote control placed by a dumpster outside next to an RC toy car. 
 
 "We believe he hoped someone would hear the boom box, try to play with the car and use a remote control that would actually blow the whole place up," Osman said. 
 
 None of the trigger systems were ever initiated, and all the bombs were successfully disarmed. 
 
 Holmes was convicted in July on one count of the possession of incendiary devices, in addition to two counts for each of the 12 murders and 70 attempted murders he committed inside the theater. He was sentenced last month to 12 life sentences, plus 3,318 years for his crimes.
– Evidence released in the wake of James Holmes' sentencing last month gives a shocking look at the deadly booby-traps the 27-year-old Aurora theater shooter had placed around his Colorado apartment. ABC News reports the apartment contained black balls filled with smokeless powder and gasoline; pickle jars containing bullets, thermite, and napalm; and soda bottles full of gasoline. A fishing line connected to the doorjamb was meant to trigger a fire by knocking a thermos of glycerin into a frying pan of potassium permanganate. Holmes left loud music playing, which drew a neighbor to the door. Fortunately, she didn't open it. He also placed a remote detonator next to an RC car near the building's dumpster in the hopes someone would play with it and blow up the apartment. "It doesn't surprise me to run across anything anywhere really," Army veteran and ATF explosives expert Gary Smith, who led the team that disarmed Holmes' apartment in the hours following his arrest, tells NBC News. "It's just a matter of time before something like that ends up here [is] kind of the way we look at it, kind of worst case scenario, you always try to think ahead." A remote-control robot was sent into the apartment to disarm most the explosives, but some had to be taken apart by hand. Five neighboring buildings were evacuated while the team worked, but in the end the apartment was cleared with no fires or explosions. Holmes was sentenced to life in prison Aug. 27 after killing 12 people during a showing of The Dark Knight Rises in 2012.