Is it safe to seek shelter in a cave during a lightning storm?

Risk of Electrical Conduction

When a lightning bolt strikes, it can create an electrical current that can travel through the ground, water, and metal objects. Caves often contain underground water sources, which can conduct electricity and increase the risk of injury or death. Even if the cave appears dry, water can still be present in the form of seeps, springs, or percolating groundwater.

Cave Structure and Features

Caves can be particularly hazardous due to their unique structure and features. Many caves contain metal objects such as old mining equipment, railings, or even rocks with metal inclusions. These objects can conduct electricity and increase the risk of injury. Additionally, caves often have narrow passages and tunnels that can funnel lightning-generated electrical currents, making it more difficult to escape.

Safe Alternatives

If you are caught in a lightning storm and cannot find a safe building or vehicle, it is generally safer to seek shelter in a low-lying area with minimal features that can conduct electricity, such as a depression or a low spot in a field. Avoid open areas and never seek shelter under a solitary tree or a group of trees, as these can be the tallest objects in the area and more likely to attract lightning. If you are in a cave and cannot escape, crouch low with your feet together and your head down, but be aware that this is not a safe option.