Hello everybody ! I want to thank you for taking some time to read this fanfiction, or at least the beginning. I have a lot of inspiration these past few days and when I was sleeping the other day, I had an idea: there was a situation the firefighters didn't have to face during the 3 seasons, and I wanted to write a situation like this. I don't know how many chapters I will write. So if you have ideas, suggestions, etc... Please review me and I will answer you in PM (if you have an ID user), or in the next chapter.

Summary: During a call in Humbolt Park, one of the firefighters found a bomb on one of the room of the house they have been called. But the bomb exploded et let four of them under the ruin of this house. Encircled by fires, flames, debris and smoke, completely stucked, they had to survive to this hell until the arriving of the rescue.

Disclaimers: I don't own any characters of TV show concerned by this fanfiction.

I hope you will like this new story!

CHAPTER 1: I'm the detonator

9:30am at the firehouse. Everybody finished to take their breakfast or their coffee. Some of the firefighters were playing cards, others were reading or watching TV on the couch with Mouch and Pouch. Everything was calm since yesterday evening according to the first shift. No call during the entire night. Chief Boden was carefull, he said it meant nothing, because the past is the past and a day didn't look like another. Despite the functional television, the firefighters could hear their own breathing. And then, if we can say it, their exhaled in relief: the alarm rang. Finally some actions, they thought. All the trucks of the firehouse 51 had been called in a structure fire in Humbolt Park. All the firefighters put their gear, took a sit on their trucks and went to the scene.

"Truck 81, squad 3, engin 51, ambulance 61, batalion 25, in route to the structure fire in Humbolt Park."

The chief's car was the first, then came truck, squad, engine and finally ambulance. Humbolt Park was a calm neighbourhood of the suburs of Chicago, but poor, insain and sensitive. People didn't like local authorities because according to them, they were spending money for themselves, but not for the population. Then, to show they weren't happy with this, they blocked the roads to not let the services of Chicago to do their job.

All the team were calm. On truck 81, Dawson was passing her left hand in her stomach, the candidate was still and was watching the road, Mouch and Hermann was reading the daily paper, Otis was focused on his driving and Casey helped him to find the scene. Arrving, Boden tried to find informations from neighbours, in vain. There was smoke escaping from the windows, including from the basement. The smoke was white so the firefighters could work without danger to find potential victims.

"Dawson, Otis, up the aerial to vent! Mouch, candidate, stay here and hold the traffic! Hermann, with the on the main floor!"

Casey took to SCBA for himself and waited the squad to dod their group before going to the house.

"Ferraris, Severide, on the basement! Capp, Cruz, with me on the first floor!"

Everybody entered the house by the main door after cutting electricity. The groups separated and came where they had to go. But after a few minutes, the firefighters noticed something. Something weird. There was a lot of smoke, but no fire...

"Chief! There is no fire here! No fire at all!"

"Are you sure Casey?"

"A hundred per cent sure! We checked the walls, everything! No fire!"

Boden was worry. If there was smoke, then there was something creating the smoke.

"Do a second research! Be carefull!"

In the same time, something was in Casey's mind. Something he didn't like. There was smoke that was passing the door of one of the room. He turned and looked around him. Tere was just a room with this weird thing. Curious, he began to unlock the door and open it slowly. But he heard a noise he didn't like. He didn't like at all. Carefully, he grabbed his radio.

"Uh... Chief?"

"What is it Casey?"

Everybody froze, stopped their activity. Because on the radio, they all heard someone with a voice he didn't have in usual. A tremlbing voice, a little frightened.

"I think... I think I found the problem chief."

Boden closed his eyes. He knew Casey. The fact he had this voice wasn't good. There was a big problem.

"And?"

"The smoke is coming from one of the room on the main floor. And uh... I... I opened the door and... There was a 'click'."

"A 'click'?"

"Yeah... It's a detonator chief. There is a bomb in this house, and uh... I became the detonator now."

Everyone let escape a gasp and hold their breath. Every second could be the last if Casey moved just a little.

"I'm sorry chief."

"Don't. You did your job Casey. Alright, stay as still as possible. I'm calling deminers."

To not frighten his men, he changed the canal to pass his detress call.

"Batalion 25 to main, I need the closest bomb squad in Humbolt Park ASAP. A bomb was found by one of my man and he became the detonator."

"Copy batalion 25."

He returned to the canal 3.

"Casey, you copy?"

"Yeah chief."

"They're coming okay?

"Chief, I... Can I say something?"

Boden didn't want to answer. But the fact he didn't answer meant Casey could say something.

"It's.. It's the first time in years... I'm terrorized. Uh... I don't know what to do or not to do."

"Casey, listen to me. Stay calm and listen alright?"

Chief Boden coudn't see it, but Casey had closed his eyes, trying in vain to have a good mood and calm himself. He nodded.

"I know you're scared. I will in your place, everybody will. But you don't have to move an inch, stay still. It's very important."

"My whole body is trembling. My hand is shivering too. I don't feel capable of this."

Casey inhaled deeply then exhaled softly, trying to regulate his breathing and stay calm.

"Hermann, squad 3, leave the house immediately, it's an order! I don't want you to be trained on this by my fault!"

"Lieutenant?"

"Please Hermann! Get out of this house!"

Outside, Dawson was tensed. She came down the aerial and ran toward Boden.

"Chief what's happening?"

"Casey found the origin of the smoke. A bomb is inside the house and he is the detonator. The bomb squad is almost there. Five minutes out."

inside, the more the seconds was passing, the more his hand was shivering.

"Everybody is out?"

"Severide, Ferraris and Hermann are still inside."

"We're almost there chief! I can see the exit!"

But at the same time, Casey heard another 'click' on the room. Frightening, he grabbed urgently his radio.

"CHIEF!"

Outside, a panic wave came between the fireman when they heard his voice, his panicking voice. Everybody shut up, and froze. Then a huge explosion has been heard and the house collapsed.

Inside, the four firefighters didn't have the time to get out the house. They had been taken by the explosion and in the collapsing, buried under tons of debris.