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Transcripción del abstract original del autor: In the most southern part of the American continent, the first underground storage facility for natural gas in Argentina has been recently developed, completing with satisfactory results an injection and production cycle over 2001 and 2002 (Fig. 1). The Diadema underground storage facility, located nearby the city of Comodoro Rivadavia, has been built to partially meet the great demand of gas for domestic and industrial use during winter season in the central and northern areas of the Patagonia, when the oil fields supplying the region with associated gas are unable to comply with gas demand. Consequently, it is necessary to store the gas coming from the gas fields located in the Tierra del Fuego island during summer and to retrieve it during winter for local distribution. REPSOL YPF took the initiative to develop with Géostock technical support this commercial project, consisting in the conversion of a depleted gas field by refurbishing old production wells, drilling new wells and installing surface equipment, using the most modern technology and complying with drastic conditions regarding safety, quality and environmental protection. This project has successfully completed the process of obtaining the Certification of an Integrated Management System. This paper presents the main geological features of the Diadema facility, points out the studies related to reservoir modelling and simulation, describes the surface and subsurface equipment at present in operation and those planned for future expansions, and indicates the operational aspects in relation to gas movements and monitoring implemented for environmental protection.