Further inside,the team slogs through a thick,muddy trench. The team’s final hurdle is its toughest challenge-they climb up a slimy 60-meter cliff made of hard minerals. After a two-day climb,they literally see light at the end of the tunnel as they reach the cave’s exit. Satisfied with the expedition to explore,map,and photograph the world’s largest cave,the team climbs out into the sunlight.They have become the first people to explore the entire length of the cave.