So clear are the steaming pools that to stare down into them is like staring down into a cave that leads to the earth's core.

FORBES: Magazine Article

In the 1980s he stumbled across an opening in the earth that was 50 meters in diameter and realized this was no ordinary cave.

FORBES: By Sonya Angraini (Forbes Indonesia)

The caving crew descends through tight passages hundreds of feet beneath the Earth's surface, guided by the gust of air that marks the cave's primary passage.

FORBES: Magazine Article