Boybuloq Cave
The cave is the deepest known cave in Asia having been explored to a depth of from the entrance. At the lowest discovered level a water-filled siphon blocks further exploration. It is thought that the cave has the potential to be the deepest known cave in the world, with a theorised depth of making it deeper than the Veryovkina Cave. The explored length of the cave is .
Laurel Caverns
Laurel Caverns, is the deepest cave in the northeastern United States and the largest in volume. Located in Farmington, Pennsylvania, it sits on Chestnut Ridge near Uniontown, about southeast of Pittsburgh.