151. Rest shelters.- The employer shall ensure at a construction site of a building or other construction work that,- (a)where building workers employed in a compressed air environment in a tunnelling work are required to remain at the work site for one hour or more after de-compression from pressure exceeding one bar, adequate and suitable facilities are provided for such building workers to rest; (b) every man-lock, medical-lock and any other facility inside these locks a tunnelling work is maintained in a clean state and in good repairs; (c) a first-aid room is provided and is readily available at a construction site of a tunnelling work; (d) each man-lock attendant station is provided with a first-aid box at a construction site of a tunnelling work. | 
