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This is 8 minutes before the bomber detonated the bomb on the commuter train, 8 minutes before everyone died, 8 minutes before the terror started.
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This is when the bomb exploded and everyone on board died.
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Source Code was already created but the explosion gave the military a chance to finally use source code to find the bomber.
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This is the countless trials that Colter did inside the Source Code to find the bomber.
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Colter finally found the bomber and prevented the next attack
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After Colter completed the mission he wanted to go back into Source code to save everyone on the train. Although he knew it wouldn't affect the present time, he still wanted to try and save them. When he did save them, he ended up living beyond the 8 minutes. This showed that Source Code created a new reality.