Zhang Liang only realized they had been tricked when Xie Debiao shouted for them to retreat. Before he and his underlings could reach the titanium alloy door, it automatically closed.

Moreover, the titanium alloy door required a mechanical password to unlock.

A group of people surrounded the door, pounding and knocking on it, but the door remained unscathed.

Suddenly, they heard faint gunshots from outside, making the group even more anxious, and they intensified their efforts to break down the door.