Speedwell Cavern
Castleton, Derbyshire
In the 1770s lead miners dug a flooded tunnel into Winnats Pass, moving through it by boat. They found little lead but broke into a vast natural cavern with a deep lake, the 'Bottomless Pit', into which they dumped their waste rock without it ever seeming to fill.
Read the full story, see it on the map, get directions and find what else is nearby in the free Hidden Britain Atlas map.
- When
- Dug 1770s
- Where
- 53.3430, -1.7910
- Group
- Caves & grottoes
Visiting
Boat tours run daily from the bottom of Winnats Pass.

The Ledger of Lost Britain
The Romans arrived in AD 43. For most people that is where the history of Britain begins. But by the time the legions landed, people had already been living on these islands for thousands of years. They had hunted, farmed, mined flint, dragged stones across the country, raised a hill by hand, and buried their dead in great tombs. They left no written words. What they left was the ground itself. Every place in this book can be visited, or has been dug up, or is in a museum.
Nearby mysteries
- Blue John CavernCave or grotto · Castleton, Derbyshire · under a mile away
- Peak CavernCave or grotto · Castleton, Derbyshire · under a mile away
- Mam TorAncient monument · Castleton, Derbyshire · under a mile away
- Derwent and AshoptonLost village · Ladybower Reservoir, Derbyshire · 4 miles away
- Mermaid's PoolDragon or monster · Kinder Scout, Derbyshire · 4 miles away
- Little John's GraveMysterious grave · Hathersage, Derbyshire · 6 miles away