Bung Hole Series Downstream Sump:
The start of the sump is very low but enlarges after 30 m to a pleasant elliptical tube for the next 120 m until a confusing area is reached after 150 m with several low and unexplored bedding planes.
Warning: This should only be attempted when water levels are low because of the risk of regaining base against the strong current.
Overspill Passage Sump:
The low sump at the end is choked with sand, this hasn't been dived.
A small sump in south wall just downstream of Treasury Sump, this is too low for diving.
Window Inlet Sumps:
A 1.2 m deep sump pool leads to an easy tube for 16 m to 40 m of low streamway. A second sump is reached, 3 m long but tight (don't free dive). 40 m of low crawling passage over loose slabs until the passage is blocked by a boulder, the stream enters from an impassable slot in the left wall.
This is a low airspace pool that isn't a sump but stopped exploration downstream for many years.
This is a short sump that reduces to a low duck in low water conditions. This can be bypassed by the short bypass.
The Bottomless Pit Sump:
A pool that has been dived to a depth of -8m but is choked with mud and rocks.
Bottomless Pit Inlet Sump:
A tight passage leads to a sump that is too tight to dive.
This is located in the Halfway House Series. The large underwater passage descends on the vein, underneath a large rock (careful has this is held in place by an ancient stemple. At 25 m from base, the roof meets the floor of fine silt at -16 m depth. THERE IS NO ACCESS TO THIS SITE.
West North West Passage Sump:
A flooded passage beyond Rowse Hall in the Halfway House Series is choked with boulders at -4 m depth. Dries up in drought. THERE IS NO ACCESS TO THIS SITE.
Pilkington's Passage Sump:
A small pool leads to a body sized passage with a mud floor for five meters to where the roof meets the mud floor. No way on could be found.
CDG Newsletter no 176, Jul 2010. Page 25
Assault Course Sump 1:
Situated on approach passage to Pilkington's Cavern, approx 30 m from the far canal. A small waterlogged tube with slot in floor, too small to dive and end is very close to Far Canal.
Assault Course Sump 2:
Downstream End of the Assault Course, the canyon sumps close to a point with the Far Canal. Too small to dive. A similar choked sump has been noted in Far Canal in draught.
Pit Props Sump:
Under the left wall at the start of the passage, steeply descending passage enters a low bedding at -2m, followed in small bedding for 3 m but carries on constricted. The water that sinks here emerges from immature bedding in south wall just below the Bung Hole Ladder.
Pit Props Inlet Sump:
Steeply descending body sized tube followed for 4.5 m to a slit blockage.
Whirlpool Rising Sump:
Small pool near end of whirlpool Passage enters a pleasant bedding tube for approx 45 m emerging in HMS Belfast, a large airbell. The sump carries on through a bedding passage for 20 m emerging into HMS Edinburgh. The sump carries on in a bedding passage, after 57 m, a pot is descended to where it becomes jambed with boulders at -11m depth. At the top of the pot, a fine airbell called Mary Rose can be gained, the passage continues low and shallow beyond this point before reaching a low junction 143 m from base.
Whirpool Stopes Sump:
A body tight tube dips down to water after 10 m, this looks too tight to dive.
A 7 m diameter pool has been dived for approx 23m depth; a hole in one of the walls was passed to reach a constriction at 26.3 m depth.
A descending tube leads via a mud squeeze into a vertical pot. This 1 - 1.5 m pot has mud covered walls so visibility goes straight away. At -38m depth a restriction has to be passed to -41 m, the current limit to the sump. The shaft appears to continue below.
A impressive sump pool at the head of the Speedwell Stream, the submerged pot descends vertically for 20m, a silt floor is met, the carries on in a fine phreatic to a floor at - 36m. A large shaft ascends to -20m to meet a sand col; Bog Pipe Rift rises diagonally upwards to a depth of -3m. A small hole with a notable current is passed leads down to -15m to a slit floor, this low passage passed through an arch roof to reach The Doux De Castleton, a fine shaft descending downwards. Above the shaft, an airbell can be reached. The shaft can be descended for -33 m, a large tunnel continuing for 20 m to a further shaft descending below. The New Leviathan is just off vertical, this descends to -65m depth, a large phreatic rift passage, Remembrance Way descends to -72 m. A low passage appears to go off but is a solid sand choke.
Valanthen, J. 2006. Cave Diving Group Newsletter 161. Page 16.
Groves, M. 2004. Cave Diving Group Newsletter 150. Page 14 - 17.
The sump is very low and awkward for the first 10 m, after this, the passage is more comfortable going reaching a small chamber after a further 20 m. Beyond here, a low shingly bedding reaches a solid choke 40 m from base.
Joint Effort Sump 1
A small shallow tube that has never been dived. A bypass near this sump regained the stream in Puzzling Evidence Chamber, this sinking in boulders so there is no point diving this sump.
Joint Effort Sump 2:
A 20 m long silty tube emerges into a small chamber. A rift upwards leads to a window into Spidros Aven.