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This 2 hour strenuous tour covers about a mile of rugged trail in a less developed, unlighted part of the cave. Each participant will carry a candle bucket. Due to the rough conditions, shoes (no sandals) with non-slip soles are required. This tour is limited to 10 people and the minimum age is 8. Reservations are strongly recommended. Reservations may only be made in person or by telephone at +1 605 745-4600. $9 fee, half-price for age 8-16 or Golden Age cardholders.