of Wookey formation. There are various high-level passages leading off from these chambers, with two small exits above the tourist entrance. The River Axe is formed by the water entering the cave systems and flows through the third and first chambers, from which it flows to the resurgence, through two sumps and long, where it leaves the cave and enters the open air. The river is maintained at an artificially high level and falls a couple of metres when a sluice is lowered to allow access to the fourth and fifth chambers, two small air spaces. Normally, however, these are only accessible by cave diving. Beyond the fifth chamber a roomy submerged route may be followed for a further , passing under three large rifts with air spaces, to surface in the ninth chamber – a roomy chamber over long and the same high. High-level passages here lead to a former resurgence, now blocked, some above the current resurgence. An artificial tunnel leading off from the third chamber allows show cave visitors to cross the seventh and eighth chambers on bridges, and skirt around the ninth chamber on a walkway, before exiting near the resurgence. A second excavated tunnel from the ninth chamber allows visitors to visit the 20th chamber. From the ninth chamber, a dive of about passes almost immediately from the Dolomitic Conglomerate into the limestone, and descends steadily for to a depth of under a couple of high rifts with airbells (enclosed air spaces between water and roof) before reaching air space in the 19th chamber. The 20th chamber is at the top of a large boulder slope – long, wide, and high. From here a roomy passage some long ascends towards a now-blocked fossil resurgence in the Ebbor Gorge. The total length of passages in this area is about . A passage near the end connects with Chamber 24 near Sting Corner. The continuation is found in the 19th chamber, where of passage descending to a depth of surfaces in the 22nd chamber – of dry passages at various levels with a static pool. The way on is within this pool at a depth of where of passage ascends to surface in the 23rd chamber – of large passage, followed by four short sumps that arrive in the 24th chamber. This is of what is described in the guidebook as "magnificent" river passage, high and wide,