
Entrance to Rising Star cave, where Lee Berger's team of 'underground astronauts' discovered the largest collection of hominin remains ever discovered on the African continent, in 2013.

The Underground Astronauts : Becca Peixotto, Alia Gurtov, Elen Feuerriegel, Marina Elliott, Lindsay Hunter, and Hannah Morris. The six cavers helped uncover 1,500 fossils from Rising Star cave in South Africa.

"These people are heroic in their efforts, they're risking their lives to go in there," said expedition leader Lee Berger (pictured with caver Lindsay Eaves). "These explorers are squeezing their bodies through cracks and crevices where you have to cease breathing to push yourself through."

"It's damp, it's dark. If you slip in certain situations you can fall and injure yourself," explained Berger of Rising Star cave. Here, Lindsay Eaves manages to work on a laptop inside the cramped cave.

"I love communicating science," said American paleoanthropologist Lee Berger, pictured. "And I love the science that I've been privileged to do -- the search for human origins.

While the Underground Astronauts searched the caves, Berger and his team monitored their every movement from a tent on the surface.

Cavers Steve Tucker and Rick Hunter originally discovered the fossils in Rising Star cave, taking photos which they later showed to Berger.




