The second incursion through the Arch facility's stone came at the second hour of the morning, nine days after Vorra's column arrived. It came through the eastern wall of the corridor adjacent to the instrument room, not through the southern wall section that had been the first probe's entry point. Aliyah had applied void compound to every warm-temperature section Urrak had identified. She had not applied it to sections that showed no temperature elevation.
The eastern corridor section had shown no temperature elevation.
What came through was not the size of a probe.
The first indication was the sound: stone grinding against itself from the inside, a resonance that traveled through the facility's walls into the floor and was felt before it was heard. Oshrak was in the operations room when the sound started and he was moving before it stopped.
