“The volcanic rocks slip under us like ball-bearings, daring us to fall on their jagged edges. But as I pant and scramble my way to the summit, a roar fills my ears. I peek over the edge of the giant crater--right next to a cross that memorializes where a woman fell in three years ago--and see the world’s largest lava lake 900 feet below. The lava bubbles, hardens, cracks, and erupts to the surface again, like flares on the surface of the sun. A National Geographic crew descends into the crater in thermal suits, trying to get a closer look at the volcano whose eruption swallowed up the town of Goma in 2002...”