Everyone braced for a powerful counterattack the moment the door opened. Even if resistance was pretty much non-existent along the way to the Cortex Prime, it was a known thing as the damage to the Cortex Prime had caused all defensive systems to go offline. However, behind the door was the central mainframe, and the central mainframe could not go offline. The reason was simple: because the fortress still emitted order after order, it meant that the Cortex Prime was still functioning.
A functioning mainframe would not allow any uninvited guests near it.
Yet, as the door opened, the anticipated attack did not come. There were also no sirens ringing throughout the fortress. In fact, Hao Ren heard nothing aside from the ambient humming within the fortress.
Even so, Vivian still whispered a warning, "Stay alert. We're already in the heart of the fortress. Anything can happen here."