The third incursion through the Arch facility's stone came at the first hour of the morning, six days after the second.
It came through the northern corridor's interior wall at a section the engineers had treated with standard void compound density during the initial application phase, before Aliyah had identified the four undersaturated sections and redirected the morning shift to triple-density coverage. Triple-density application on that section had been completed three days ago. Whatever had been pressing against it from the other side had been pressing against it longer than three days.
