During this combo tour, you'll be able to explore Icelandic crystal clear waters while snorkelling as well as you'll be introduced to the underground wonders while exploring the longest lava tube in Iceland. The first part of the tour starts in Raufarhólshellir lava cave which is famous for its stunning minerals - the place of colourful stalagmites and stalactites. The cave is 1360 metres long and the ceiling reaches 10 metres high, so no need to worry about crawling! After caving experience you'll have some time off to grab some lunch and we'll be waiting for you at your next stop - Thingvellir national park for your second activity - snorkelling between Eurasian and North American tectonic plates. The water in Silfra is being declared as the clearest waters on Earth as the visibility reaches close to 150 metres. This is a one-of-a-kind adventure everyone needs to have while in Iceland!