This 3 to 4-hour strenuous tour is designed for visitors who want the thrill of experiencing the cave in its natural state. Participants scramble over cave 'breakdown,' chimney between walls, climb semi-vertical rocks (rope-assisted), and belly crawl through tight passages along a 2/3 mile route. Participants must be in good health and physical condition. Participants are required to fit through a passage 8 1/2 inches high by 24 inches wide. Participants must provide and wear specific caving clothes and boots. Tours may be cancelled due to a lack of required participants; proper caving equipment;or unforeseen incidents. Tour size is limited to a minimum of 2 visitors and a maximum of 5 visitors. Reservations are required for this tour and tour dates are limited. Tours are offered from mid-June to the end of August.