There are two St Cubert’s or St Cuthbert’s wells in Cubert parish. One of them is one of Cornwall’s most unusual holy wells for it is situated in a cave at the eastern end of the great expanse of Holywell Bay beach.

The well is hidden in a cave which is only accessible at low tide.

The water in the well runs slowly down a cascade of steps, each with its own pool of limpid water. Over time, the water has dropped off a layer of minerals resulting in a smooth, highly-coloured surface: a flowstone, which is a form of horizontal stalagmite. Tradition has it that every visitor should drink from the well.

Such deposits are usually found in limestone areas where the slightly acidic waters have dissolved Calcium Carbonate and then dropped it during evaporation: yet there are few sedimentary rocks in this part of Cornwall. However, it is now thought that there may be thin bands of limestone close by which may be the source of the mineral.

Some advice for those seeking the well:

• Make sure it is a good low tide and that you keep an eye on the level. Holywell is a shallow beach and the tide comes in fast
• The cave is not where it is shown on Google maps. We got a good signal at the mouth of the cave here
• The steps up to the well appear to be slippery but were accessible in walking boots but we would advise against using wellies. Tough bare feet or wetsuit boots may be better
• Inside, the well actually issues from an upper chamber. Those of a non-claustrophobic disposition, who don’t mind getting wet and who have suitable footwear, can walk up the through the pools into the upper chamber
• A strong light or torch is recommended. Phone lights are helpful but something stronger would be better. A camera will probably need a flash