The Sellafield Retreatment Plant (SRP) is part of the United Kingdom’s Nuclear Decommissioning Authority’s (NDA) initiative to gradually transfer, repackage, and safely store 140 tons of separated plutonium for 100 years, playing a vital role in safeguarding public health, protecting the environment, and advancing scientific knowledge. Proicere is delivering the project subject to complex regulatory requirements and stringent safety standards. To meet these criteria and coordinate multiple disciplines and interfaces amid schedule pressures, Proicere needed a collaborative digital solution for optimal planning, execution, and monitoring.  Proicere leveraged SYNCHRO for 4D planning and scheduling, empowering the team to digitally visualize, plan, and execute the complex site works. Working in a connected digital platform, they established a digital twin to perform construction simulation, streamlining workflows, as well as identifying and mitigating over 160 potential risks. The digital solution has already saved GBP 73.2 million in costs, avoided over 500 days of rework, and achieved a substantial reduction in environmental impact. By maximizing handprint and minimizing footprint, the project sets a benchmark for sustainable infrastructure development in the industry.