On the Chajnantor Plateau, at 5000 meters altitude, there are the 66 antennas that constitute the ALMA radio telescope. 2 kilometers below is the Operation Support Facility, where many engineers, technicians, and scientists work nights and days. In this episode, Giorgio Siringo, Senior Radio-frequency engineer, explains the team's working schedule. Moreover, Cristian Puentes, Director of Finance and Administration, tells us how the ALMA Observatory takes care of the hospitality for the staff.