When Ye Xiajie spiraled out of control and the Abyss nearly went wild, a lot of issues arose. Many inmates had fled, including some of the most vicious criminals. His sense of reason returned to Ye Xiajie. He closed down the whole Netherworld and governed the entire Nether System. Since a significant portion of the captives' qi has been trapped by the Nether Chains, they are unable to employ their natural strength, which prevents them from fleeing.
Without the key, taking off the Nether Chains is practically impossible. Also, the blood of Ye Xiajie and Hei Anjing was used to create the key that would open the chain. It would be nearly hard to take this couple's blood. They were seriously taken into account as Sovereign Gods.
Ye Xiajie commanded, "Warden Lou, Warden Yun, Zhi Yang, and Zhi Yue, go ahead and recapture the prisoners that haven't left the vicinity of the Nether Prison yet. I had put it on lockdown. A'Liang guide them with the routes."