Starting your adventures underground

Cave
Conservation

Caves may contain fragile environments which have taken thousands of years to form.

Some caves are quite robust whilst other are very delicate. Care is needed to avoid lasting damage and all cavers should be guided by the Cave Conservation Code:

  • Cave with care and thought for the environment
  • Disturb nothing whether living or geological
  • Avoid touching formations
  • Keep to marked routes and never cross conservation tapes
  • Take nothing but photographs
  • Do not pollute the cave – leave nothing behind

Bnr brochure

How are
caves made?

Caves are natural cavities formed under the Earth’s surface most commonly in limestone rock. Caves vary massively in size from gigantic caverns to tiny tubes and range from a few metres to several kilometres in length and depth.

Caves are formed when the limestone dissolves over a very long period of time. Rainwater collects carbon dioxide from the air and as it percolates through the soils it turns into a weak acid. Over thousands of years this water penetrates the joints, bedding planes and fractures of the limestone and dissolves the rock, eventually into passages large enough to explore.

As the surface topography changes the streams cut down to new and lower routes leaving the caves high and dry. These older passages often contain muddy sediments and breakdown boulders but also they may contain wonderful arrays of cave formations like stalactites, stalagmites and weird and wonky helictites.

The cave formations, or speleothems as they are collectively known, form when water saturated with calcium carbonate seeps down through the rock and enters the open passages. The drips deposit tiny amounts of the calcite which over time build up to create the stalactites on the roof and stalagmites on the floor below. Eventually some join to form columns.

Get started

Contact a caving club or instructor to start your adventures underground.

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