Caves pockmark the world, extending deep into the bowels of Earth. Numerous caverns are record holders, consisting of one in Kentucky that’s the longest understood cavern system another in Vietnam that’s the biggest cavernand one in Mexico that holds the title for the longest undersea cavernCaverns are understood for being dark voids, so which is the inmost cavern on Earth? And which weird animals live at their inmost depths?

There’s no clear winner, Live Science discovered. Rather, there are 2 caverns that alternate as the record holders for the inmost cavern on our world: Veryovkina and Krubera-Voronya (likewise spelled Voronja), limestone collapse Abkhazia, a self-governing republic in the Republic of Georgia.