The Ruhr region in western Germany, once the powerhouse of the country's heavy industry, is still dealing with the long-term effects of coal mining. For over 150 years, extensive underground mining operations have caused the ground to sink in some areas by as much as 25 meters. This phenomenon, known as ground subsidence, is the result of longwall mining, a method where large sections of coal are extracted, leaving behind voids that cause the earth above to gradually sink. To prevent flooding in these sinking areas, more than 200 pumps operate around the clock at six different locations. These pumps remove roughly 70 million cubic meters of water every year, a task referred to locally as the "eternal mission." This massive effort costs between 220 and 265 million euros annually and is funded by the RAG-Stiftung, a foundation with about 21 billion euros in assets. The foundation was established to manage the long-term consequences of coal mining in the region. In cities like Essen, the ground has sunk about 16 meters compared to its original level, making traditional flood prevention methods such as dikes ineffective. The unique geological situation requires a continuous pumping system to prevent groundwater from rising and flooding urban areas. This system has become essential to maintaining the safety and stability of the region. The ongoing need for this pumping operation highlights the lasting impact of industrial activities on the environment and infrastructure. It also underscores the financial and technical responsibilities that future generations must bear due to past industrial practices. As the Ruhr region continues to transition from its industrial past to a more diversified economy, the challenge of managing these long-term effects remains a critical concern.