| 词条 | Speedwell Cavern |
| 释义 | {{Infobox Cave | name = Speedwell Cavern | photo = Speedwell Cavern 2015 03.jpg | photo_caption = | location = Castleton, Derbyshire | coords = {{coord|53.3414|-1.7921|type:landmark_region:GB|display=inline,title}} | depth = | length = | survey = | survey_electronic_format = | discovery = | geology = Limestone | entrance_count = | difficulty = | hazards = | access = | translation = | language = | pronunciation = | website = Speedwell Cavern official website }}{{OSM Location map | coord ={{coord|53.3414|-1.7921}} | float=right | zoom =11 | width = 255 | height = 300 | mark-coord5= {{coord|53.3414|-1.7921}} | label5 = Speedwell Cavern | label-size5=13| mark-size5=11 | label-pos5=left| label-color5=#666644 | mark-title5 = Speedwell Cavern | mark-image5 = Speedwell Cavern 2015 12.jpg | mark-description5 = Speedwell Cavern, Castleton | caption=Location of Speedwell Cavern, Derbyshire, and the other nearby caves. | mark-coord1={{coord|53.3333|-1.79329}}|label1=Titan|label-size1=10|mark-size1=8||label-color1=#888866|mark-title1=Titan (cave) | mark-coord2={{coord|53.3456|-1.8035}}|label2=Blue John Cavern|label-pos2=top|mark-title2=Blue John Cavern | mark-coord3={{coord|53.3451|-1.7972}}|label3=Treak Cliff Cavern|label-pos3=right|label-offset-y3=-3| mark-title3=Treak Cliff Cavern | mark-coord4={{coord|53.3409|-1.7791}}|label4=Peak Cavern|label-pos4=right|label-offset-x4=-7|label-offset-y4=9|mark-title4=Peak Cavern }} The Speedwell Cavern is one of the four show caves in Castleton, Derbyshire, England. It consists of a horizontal lead miners' adit (a level passageway driven horizontally into the hillside) leading to the cavern itself, a limestone cave. The adit is permanently flooded, resulting in Speedwell Cavern's (locally unique) feature: after descending a long staircase, the visitor makes the journey into the cave by boat. Originally the guide propelled the boat by pushing against the walls with his hands, later the boat was legged through, and now it is powered by an electric motor. At the end of the adit, the visitor alights from the boat and walks into the cave to see the fluorspar veins, the stalactites and stalagmites, and the so-called "Bottomless Pit". This pit is an extremely deep vertical shaft, now choked to within {{convert|20|m|ft}} of the surface by rock spoil dumped by miners. The original depth of the shaft has been estimated, from the amount of spoil placed in the shaft over the years, at around {{convert|150|m}}. {{commonscat|Speedwell Cavern}}A connection was discovered in 1999 between the Speedwell Cavern system and Titan, the largest natural shaft in the UK, which is {{convert|141.5|m}} high. {{Derbyshire Places of interest}} 5 : Caves of Derbyshire|Tourist attractions in Derbyshire|Tourist attractions of the Peak District|Show caves in the United Kingdom|Limestone caves |
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