The Hawk's Nest Tunnel tragedy in West Virginia in the 1930s drew national attention to occupational health issues. During construction of a tunnel through silica-rich soil, over 700 workers contracted silicosis from inhaling silica dust and over 400 died. This tragedy highlighted the need for protections against respiratory hazards and spurred the first National Silicosis Conference in 1936. Major workplace disasters have often accelerated the safety movement by revealing deficiencies in protections and leading to new regulations.