Under the Stone Sky.

On the eve of Man's conquest of the Moon, in the summer of 1969, 34-year-old Milutin Veljković set off to spend the following 15 months in a two-kilometer long cave in the Southeast Serbia, in a company of a dozen of hens and ducks, and a puppy. Veljković wasn’t just interested in beating the record in cave dwelling - he aimed to penetrate into the universe of depth.