The Crank pits is the area underneath the main WICKED Complex where WICKED kept large numbers of Cranks to study on them. Cranks in the area would often wander inside and find themselves unable to get back out.
When young Thomas, Minho, Alby, and Teresa were found to be sneaking outside the complex, they were punished by being forced to venture into the Crank pits. While they were protected from the Cranks by the fencing, the experience was traumatizing for all of them.
The Crank pits only appear in The Fever Code.