SMARTMINE GUARDIAN: AN IOT-DRIVEN SAFETY AND ENVIRONMENTAL MONITORING SYSTEM FOR UNDERGROUND MINES. International Journal of Engineering Research and Science & Technology, [S. l.], v. 21, n. 4, p. 40–47, 2025. DOI: 10.62643/. Disponível em: https://ijerst.org/index.php/ijerst/article/view/1486. Acesso em: 12 nov. 2026.