You and your companions piece together clues from the shift change schedule and confirm that a mutiny occurred at the mine during an undocumented period. The duty rules were quietly rewritten, manpower was drastically reduced, and the whereabouts of sergeants such as Milo, Breck, and Devin are now a mystery. You first try to get the truth from Milo, who has long been corrupted by his will to survive. Then, following the clues, you find Breck, who, despite appearing to go with the flow, has left behind a key to the mine caves.
Inside the mine cave, you find an anonymous journal and learn that Crimson Marrow has been mined under the Grand Duke's orders for at least a year, and that someone named Klaus was caught up in the storm for his loyalty to those orders. The clues ultimately point to Devin—only by finding this sergeant, who still supports the commander, can the fragments of the truth be pieced together, blocking the outflow of ore. Darya returns to the transfer zone first to look after the miners, while you, Airona, and Boyce follow the mine cart tracks to the Transport Station, ready to continue digging into the smuggling chain and the mastermind behind it.