During this combo tour, you'll be able to explore Icelandic crystal clear waters while snorkeling 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 colorful stalagmites and stalactites. The cave is 1360 meters long and the ceiling reaches 10 meters 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 - snorkeling 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 meters. This is a one-of-a-kind adventure everyone needs to have while in Iceland!