This course examines new and emerging methods for investigating the histories of technology by focusing on the "technological undergrounds." Undergrounds have figured powerfully in human histories and imaginations as places of alterity, concealment, exploration, and discovery; as well as spaces of hope, refuge, and fugitivity. The course leads students through a collection of technological undergrounds — real and figurative — to examine the unexplored and underexplored histories of technology. What people and technologies have historically occupied these spaces? How can the idea of the underground help us approach people and technologies traditionally written out of our histories? What can it reveal about agency, resistance, and the category of technology itself? Drawing on recent work in global history, critical race studies, postcolonialism, and digital humanities, the course analyzes the particular challenges posed by source materials and current frameworks, and encourages students to develop new analytical tools, frameworks, and modes of scholarly expression.