Yes, it is. People need to be very careful. Caves are often wet because of water, and you can fall down. You should also wear safe hats and good boots. You sometimes need to wear warm clothing because caves are usually cold. It's very important to take lights, too. You can't see anything without them. I have a light on my hat, so I don't have to hold one in my hand. Oh, and never go in a cave alone. I always explore caves with two or three other people.