Underground storage refers to the practice of storing various materials, such as natural gas, petroleum, or water, in subterranean facilities. This method is often used to manage resources efficiently, ensuring a steady supply during peak demand periods. The storage sites can include depleted oil and gas fields, aquifers, or specially designed caverns. This type of storage is beneficial for energy management and environmental protection. By keeping resources underground, it minimizes surface disruption and reduces the risk of spills or leaks. Additionally, underground storage helps stabilize prices and supports the overall reliability of energy systems.