The French horror industry provided many movies during the 2000's and early 2010's and suddenly more or less disappeared, at least in France, and the directors moved away to Hollywood ( Alexandre Aja, Xavier Gens, Eric Vallette ) because of bigger budgets at their disposal and the opportunity to increase their popularity; bigger budget but also pain the ass producers on their back. This movie offers the peculiarity to show a first part which looks like a social drama, a semi documentary about pit coal workers, underground miners, during the fifties, a plot speaking of racism...And suddenly, after the first part, it suddenly turns into a horror film, as we have seen before in the American and also some French industry stuff. Good directing, acting, production design - which surprised me, especially in the first part, with Philippe Torreton whom I did not expect to see in a horror film. I like Samuel Le Bihan, in a charismatic leader role, tough, rough, fair, the same kind of character - or more precisely personality - he had in TOTAL WESTERN. Good French horror film which also made me think of Neil Marshall's THE DESCENT. But for me it is so surprising that there is NO FEMALE character in this film, in a period where strong lead women characters, even in actioners, are galore. Galore. It would not have surprised me to have here a woman sent among men, into the mine, fighting alone against the "thing".