![](http://www.alamy.com/thumbs/6/4EAE91E9-7B12-4060-A0C5-7022856F7620/2CMYFTA.jpg)
Blocked phreatic tube used by lead miners for access in Speedwell Cavern, Castleton, Derbyshire
Size: 3104px × 4672px
Location: Speedwell Cavern, Castleton, Derbyshire
Photo credit: © Phil Wolstenholme / Alamy / Afripics
License: Royalty Free
Model Released: Yes
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