A method for providing a protective coating in a mine comprising spraying onto the rock surfaces of the mine a hot melt adhesive in an amount to form a coating at least 1 mm, preferably at least 2 mm in thickness and allowing the coating to solidify. In one mode, in response to encountering a monitored event, an interrupt is generated. The tag is also printed with the printed article to allow readers to identify. The at least two entrance openings are provided in the enclosure. Further, the presentation module may be operable in a presentation mode to make the educational presentation accessible for viewing at a plurality of student computing devices.