Surface water, draining the surrounding plateau, works its way into cracks in the limestone, dissolving the rock and forming a slightly acidic solution. This erodes the rock strata, carving out passages down through the rock until it reaches an impermeable layer. It then either forms an underground reservoir or seeps sideways to escape out through a cave in the side of the plateau. The slowly seeping water carries a calcium-based sediment which accumulates in certain places to create those exquisite formations. With no previous experience required, caving is suitable for just about anyone.
Many people wonder if they'll become claustrophobic in a cave.
This is very unlikely. People who are claustrophobic wouldn't even entertain the idea of caving, let alone think about giving it a go. It is quite a physical activity but lots of fun and a truly unique experience.