My wife managed this, and she is claustrophobic- thought this was worth getting in for those needing to know.
As a cave visit, we had about 20 minutes as part of a tour, but if you wanted to see a lower level (not for claustrophobic sufferers) I think 45 minutes is needed.
You enter at the top of a caveman theatre, a huge cavern which clearly has been used for concerts with permanent seating installed. The stalagmites and stalagtites are lit with changing colours and beautiful for it. The musical background adds to the atmosphere.
You have to follow a route downwards, careful on slippery steps but there are feet grips and stair rails so safe for most if you take care.
More areas to see have lit coloured limestone which make for a pleasant experience. The lower area has more to offer but is perhaps more slippery, a few more steps (metal step ways) and needs more time.
You are led towards the exit which is lower than the entrance and you get to meet the Barbary Apes that live in these parts - entertainment in themselves!
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