This article sheds light on the experiences of people waiting for a liver transplant. I argue that waiting lists serve as a technological tool to deal with the uncertainties inherent in medicine, but like Hercules fi ghting Hydra, one tamed uncertainty is merely replaced by two new ones. Drawing on ethnographic material from Germany, I argue that these lists retain those waiting in a temporal limbo of uncertain duration and outcome, making them spatially, temporally and existentially immobile.