At the British nuclear facility Sellafield, specialist teams have successfully emptied some of the oldest tanks storing highly active liquid waste — the Highly Active Liquor Evaporation and Storage (HALES) facility. These containers have stored highly active liquid for several decades, generated during the processing of spent nuclear fuel. The completion of waste pumping from the oldest tanks is considered a significant achievement as part of a long-term program to reduce nuclear risks at the facility. The reduction in the volume of stored highly active liquid waste decreases potential hazards to personnel and the environment, as such liquids present the greatest risk among all types of nuclear waste due to their high radioactivity and the need for constant cooling. Sellafield remains one of the world's largest and most complex nuclear waste management facilities, inheriting infrastructure from the early days of the British nuclear program. Sellafield Ltd is implementing a large-scale modernization and decommissioning program for obsolete facilities, seeking to minimize environmental and technical risks associated with the legacy of nuclear energy from past decades. The emptying of these tanks is viewed as a step toward further site remediation and preparation of infrastructure for safe dismantling. Work on such facilities requires high precision and strict adherence to safety protocols, given the nature of the materials that were stored.