Well, what does it take for a bunch of schoolchildren to have an epic adventure during the school outing to the model camp of the county? You know, the one with the water slides and the tree train and the sports facilities, the chocolate kiosks and so many more. Let's see. First of all, an ancient battle, an even more ancient secret, then a curious girl named Maro, her 11 school mates, a clown driver, a guide- girl, and, of course, one enchanted swing. A swing that nobody could imagine it is a Portal to a magical place... What seemed to be a great adventure, soon turned out to be a nightmare. They became heroes of another dimension, stuck in a place somewhere near the center of the Earth. What is the well kept secret from the beginning of times? Will they be able to return? Well, for one of them maybe things are not so easy...