Several passages lead from the entrance, known as "The Vestibule". The only one open to the public is "
Lumbago Walk", named as traversing it requires most adults to stoop. The route continues through two main caverns, "The Great Cave" and "Roger Rain's House", and into a passage, "Pluto's Dining Room" – This is now the furthest point currently open to the public, but before 1990 the show cave extended almost twice its current length; down "The Devil's Staircase" to "Halfway House" along a raised bank path which crossed an
underground stream known as "Inner Styx" via a series of four wooden bridges, under "Five Arches" to the junction of Buxton Water Sump. This section often floods in winter, and occasionally summer, which required regular clearing of debris and mending of the safety fences at the start of the tourist season in April (cave tours were not an all-year event until 1997). In the mid-1980s, there was a worldwide scare over the possible dangers of
radon, a gas found to be present in this lower part of the cave and a potential issue for tour guides frequently exposed to it. This, along with the maintenance required, led to the Five Arches part of the tour being closed to the public in 1989, the same year that the BBC filmed
The Chronicles of Narnia at this location. It can, however, still be accessed by cavers,
and a ventilation system here expels cave air to surface at Cave Dale.[4][5][6] There have since been efforts to return this area of cave to a more natural state by erasing the history of its show-cave past, removing the wooden bridges which had served generations of paying visitors.