In this section the following words have the meanings indicated. “Cave” has the meaning stated in § 5-1401 of the Natural Resources Article. “Commercial cave” has the meaning stated in § 5-1401 of the Natural Resources Article. “Owner” has the meaning stated in § 5-1401 of the Natural Resources Article. “Person” has the meaning stated in § 5-1401 of the Natural Resources Article. An owner of a cave or the owner’s authorized agents acting within the scope of their authority are not liable for injuries sustained by any person using the cave for a recreational or scientific purpose if the prior consent of the owner has been obtained and if no charge has been made for the use of the cave. An owner of a commercial cave is not liable for an injury sustained by a spectator who has paid to view the cave unless: The injury is sustained as a result of the owner’s negligence in connection with the providing and maintaining of trails, stairs, electrical wires, or other modifications; and The negligence is the proximate cause of the injury.