Deep within the claustrophobic megatrenches of a stalemated World War, solo recon units called "Canaries" dwell in the hollows of abandoned bunkers. These isolated operators watch and wait, using specialized drones to track the lumbering war machines roaming the mud-soaked labyrinth above. They time their strikes for the precise moment a window of opportunity opens. Vigilant and disposable, they are the first watch on the wall. The true canaries in the coal mine.