Some of the miners at Crandall Canyon -- including one of the trapped men -- apparently were concerned about working in the area of the collapse, a source told CNN.

CNN: Camera lowered into mine cavity shows 'survivable space'

Watarrka (Kings Canyon) National Park features one of the most spectacular sights in central Australia - the yawning chasm of Kings Canyon.

BBC: Lonely Planet's top 10 in Australia's Northern Territory

Cantor may have led his colleagues out of the debt-ceiling canyon only to get them trapped in another one.

NEWYORKER: The House of Pain

We came through a road that really was like a canyon, the snow 8-10 feet high and room only for only one vehicle.

BBC: Spring snow: Thousands of animals feared dead