During times of conflict, caves have been used for military and civil defense purposes. In World War II, caves in the St. Louis area were considered as potential bomb shelters and storage facilities for critical supplies. While these plans were not fully realized, the strategic location and natural protection offered by caves made them valuable assets in times of crisis.

Overall, caves in St. Louis have served a variety of purposes throughout history, reflecting the region's rich geological heritage and cultural significance. From shelter and resource extraction to tourism and defense, caves have played important roles in shaping the history and identity of St. Louis and its surrounding areas.