The Deep Living Rock Caverns are a members-only area that can be accessed by climbing down the ladder at the top of the Living Rock Caverns, but the ladder is surrounded by a thick piece of metal rock, which can only be mined down by players with a Mining level of 80+. Once the metal rock has been mined down, it instantly appears blocking the ladder for any other players, so a requirement for entering the area is a mining level of 80.