The document summarizes the in-situ treatment of a 25-year-old lagoon contaminated with weathered crude oil in Peru's Pacaya Samiria National Reserve. The treatment involved injecting an ECOSAFE solution into the lagoon to simultaneously treat surface oil, water, and 5 meters of impacted sediment. Photos show the oil desorbing from the sediment and forming a foam-like emulsion, indicating a change in its properties. Further treatment degraded the emulsion while releasing clean debris. After treatment, the lagoon surface was clear and sediment particles were oil-free, demonstrating successful remediation of the three contaminated matrices without harming the sensitive ecosystem.