First Aired: Mar. 01, 2017 on NBC
Summary: Truck and squad are called to aid in a massive all-city response when an old, ill-equipped factory-turned live/work space quickly turns into a firestorm, trapping countless unsuspecting victims. The dire situation quickly turns personal when it is discovered that one of Chicago PD's …
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- Goof (crew or equipment visible): When Suzie, Severide, Casey and the Chief are talking Casey's mike cord outline can be seen through his shirt.
- Goof (revealing mistake): When doctors are examining Lexi, there is a large burn on her chest that appears to continue under her clothes, yet her clothes aren't burned. There's no way the skin beneath her clothing could get burned without the clothing also getting burned. Moreover, since only part of her skin is burned, only part of her clothing should be burned as well, yet her clothing looks consistent throughout.
- Goof (plot holes): A massive search and rescue effort is made in the burning warehouse. Despite a huge response, not one drop of water is seen being used to put the fire out in any scene.
- The central event of this episode is based on the December 2016 Ghost Ship warehouse fire in Oakland, California. Although the fictional fire's fatalities eventually number 39, within the time frame of the episode, there are 36 confirmed deaths, the same number as in the real-life Oakland fire.
- The story that Olinsky reads to his daughter at the end of the episode is "Down The Rabbit Hole" from Alice in Wonderland.
- The incident in this episode is very close to the details of the Ghost Ship warehouse fire in Oakland, Calif., in Dec. 2016.
- When the balcony collapses on Mouch, you can hear his Personal Alert Safety System (aka P.A.S.S. device) activating. But the sound you hear, the up and down whistle, is actually a warning alarm to let the firefighter know he/she has not moved in 60 seconds. If the firefighter does not move, the actual "firefighter down" alarm is 3 times as loud and is a 4 tone tweet.