Sinkholes: Swallowed Alive
These geological time bombs are ticking beneath at least 20 per cent of America's surface. Dive into the bizarre and growing phenomenon sweeping the states and beyond.

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  • Sinkholes: Swallowed Alive

    Sinkholes: Swallowed Alive

    These geological time bombs are ticking beneath at least 20 per cent of America's surface. Dive into the bizarre and growing phenomenon sweeping the states and beyond.
    Duration: 44 Min