Why is there two shafts in a coal mine?

Coal mines often have two shafts to enhance safety and operational efficiency. One shaft serves as the main entry and exit point for miners and equipment, while the second shaft acts as a ventilation route, allowing fresh air to circulate and reducing the risk of gas accumulation. Additionally, having two shafts provides an emergency escape route, improving safety in case of accidents or emergencies. This dual-shaft system is essential for managing the challenges of underground mining.