Chinese Guano Miners
Chinese labor was imported to South America to mine the guano (dried bird shit) as fertilizer. The guano islands where birds left deep layers of guano were extracted by indentured Chinese laborers whom were treated like slaves. There was no escaping the guano islands since they were surrounded by water and the only way was by ship. The mining kicked up a toxic dust which killed many Chinese laborers. They ate and slept on the guano. Few survived the ordeal. What a shitty job.