Maxime is a young miner, sharing his time with his girlfriend and his childhood friend, Julien, disabled after a car accident caused by Maxime. One night, an explosion resounds underground and Maxime heads down, desperate to save his colleagues.
Maxime, a Val-d'Or native in his early twenties, works in an underground mine near his hometown. He shares his life between his girlfriend and his childhood friend Julien, now disabled following a car accident caused by Maxime a year before. Since then, guilt eats him slowly as he intends to redeem himself, only to find Mario, Julien's father, on his path, slowing the process down. The father, who works at the mine with him, still holds a grudge for his role in the accident. One night, there is an explosion underground and Maxime heads down with the firm intention to bring all his colleagues back alive. Through the daily life of these mine workers, UNDERGROUND puts forward the contrast between the harshness of the setting of underground mines and the great humanity who work there.