About the title
Sanya, a teenage truck who has worked in a quarry with his parents his whole life, accidentally meets city dwellers: another truck and a street-sweeper truck. These new acquaintances open up an enormous, amazing world beyond the quarry to Sanya — a world now facing a serious threat: an awakened volcano in the mountains. Now Sanya and his friends must figure out how to defeat the disaster and convince all the trucks to unite before it's too late.