called the Pothole tunnel, the Peanut tunnel and the Peacock II tunnel. Each of these three tunnels has a permanent guideline (called a gold line) placed in it to ease navigation by cave divers. Pothole Tunnel The Pothole tunnel, named for the sinkhole down the tunnel from Peacock I, is the deepest of the three tunnels with a maximum depth of . It contains large open passageways, relatively high ceilings and a silt bottom. The walls are often covered in silt but occasionally the silt will be blown away by floods exposing the white limestone underneath. Peanut Tunnel The Peanut tunnel is a relatively shallow and narrow tunnel. It is named for a section that resembles the two lobes of a peanut. Its depths range from . At approximately into the tunnel, crossover tunnels connect the Peanut tunnel to the Pothole tunnel. Peacock II Tunnel The Peacock II tunnel leads to Peacock II spring. Peacock II Peacock II Spring is a smaller spring than Peacock I. It is one of only two sites available for diving by open water divers, as it contains no access to the cave system. Pothole Pothole is a small inline sink approximately one third of the distance between Peacock I and Olsen. The sinkhole has a very small entrance into the Peacock Springs cave system and due to the steep sides, it is inaccessible to cave divers. Olsen Sink Olsen is a small inline sinkhole approximately from Peacock I down the Pothole tunnel. There are two small entrances into the cave system at Olsen dropping into the same tunnel. Being central to the cave system, Olsen was once a popular entrance for cave divers as it allowed easy access to much of the cave. To prevent erosion, cave divers are no longer permitted to enter at Olsen sink as of 2002, although it remains a popular place to temporarily surface during a dive. Orange Grove Orange Grove is a large terminal sinkhole northeast of Peacock I. With a raised walkway and stairs leading into the sinkhole, it is a popular entrance into the cave. Two winding tunnels extend from the sinkhole called Lower Orange Grove and Upper Orange Grove. Lower Orange Grove is a deeper tunnel extending down to . As a very advanced dive, it is not as popular as Upper Orange Grove. Upper Orange Grove is a winding tunnel in all three dimensions