How does vulnerability become hidden in a complex sociotechnical system? This talk analyzes the key factors that contributed to the hidden vulnerability in Fukushima Daiichi. It illustrates the process through which the institutional production of vulnerability is inextricably intertwined with epistemological bias. The presentation will end with a screening of "A Journey to Namie," a short documentary about a small town located 20 kilometers from Fukushima Daiichi. Exploring an array of contaminated places in the town, this documentary captures the voiceless of Namie as ongoing victims of techno-natural disaster.