Abismo Guy Collet
The Abismo Guy Collet (SP-090) is the deepest cave in South America, and the deepest in the world that is formed in quartzite. Located in a tepui in northern Brazil near the border with Venezuela, this cave was first explored by cavers in 2006 to a depth of 671 meters.
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.