The visit is made with a local guide equipped with an oil lamp who will take you, first by wlaking to discover the first 2 rooms then after dolls cave, rafts will be waiting for you to take you o,n the river to the access to the last room, the Cuffin cave. All this in great darkness because there is no lighting inside. I recommend that you, especially if you want to take good pictures or film, to bring a powerful flashlight with you because the guide's kerosene lamp will quickly show its limits. I visited the cave in the morning but it seems that being there a bit before sunset is definitely worth it. You will see hundreds of thousands of bats coming out to feed at night and lots of birds coming in. A crossover that must be impressive.