In this video, we follow a river underground for two miles to see where it leads. Along the way, we navigate through caves and tunnels, taking in the unique surroundings. As we keep going ...

This time, we're diving even deeper into the massive underground river cave that lies beyond the mysterious pipe entrance. With new challenges ahead, we navigate the dark and winding passages ...

Deep underground, a construction crew is hard ... In coming months, the drill will go under the river itself. The mining must be complete by the start of next year. The Washington Post went ...