Dagar's report arrived before the Iron Redoubt reopened its gate.
The old quarry conduit had appeared on records created before his dungeon claimed the fortress site. Engineers sealed the connection during the Redoubt's early expansion and inspected the visible barrier each year. No one had surveyed the tunnel beyond it after the surrounding ground shifted.
The seal remained intact until the evacuation exercise opened dormant ventilation channels. Pressure moved through connected shafts, loosened damaged stone, and allowed the tunnel predators to reach the maintenance passage.
Dagar did not describe the event as unpredictable.
[We treated a barrier as secure because inspections confirmed the part we could see. We did not verify the ground supporting it or the passages beyond it. The failure belongs to the Redoubt.]
