translate English to French: Thanks to the curative properties of the air, a subterranean health centre has been opened on the fifth level (211 m below ground level), for the treatment of bronchial asthma and allergies.
Comme l'air de la mine possede des propriétés curatives, on a aménagé au cinquieme niveau (a 211 m de profondeur) un sanatorium ou l'on traite de nombreuses allergies ainsi que l'asthme.