14. The number and identity of the persons underground must be determined in accordance with the following procedure:(1) before going underground, the worker shall leave his identification tag in the place designated check-in control; the tag shall bear the worker’s name or identification number;
(2) after returning to the surface, the worker shall remove his identification tag from the place designated for check-in control and leave it in the place designated for check-out control;
(3) whenever a person accompanies a worker underground, that worker shall attach another tag bearing the word “visiteur” to his own identification tag.