The special attraction of hidden caves!
Water is a fascinating element, and the mysterious underwater worlds have a special appeal. This is precisely what inspires many divers and draws them into the depths time and time again. But while you normally dive in lakes, rivers or oceans - i.e. on the surface of the earth - the question arises: what does an underwater landscape look like in hidden caves, deep underground? The passionate apnoea diver and explorer Jan Holland tells us about his experiences.