Caves and Karst landscapes are vital yet often underappreciated environments. A Karst is a distinctive topography in which the landscape is largely shaped by the dissolving action of water mainly on carbonate bedrock (usually limestone, dolomite, or marble). This geological process, occurs over many thousands of years, results in unusual surface and subsurface features ranging from sinkholes, vertical shafts, disappearing streams, and springs, to complex underground drainage systems and caves. They host extraordinary biodiversity, provide drinking water resources and support livelihoods of millions of people. They are also sources of cultural heritage, natural resources, and recreational opportunities. Caves and karst landscapes cover nearly a quarter of the Earth's land surface and provide drinking water to more than a billion people. Shaped over millennia by the slow dissolution of soluble rock, these hidden environments preserve unique subterranean biodiversity, irreplaceable g...