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NOVA: Sinkholes

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"Sinkholes: Buried Alive" – Investigate how sinkholes form and what it's like to have your world vanish beneath your feet. (Also Fri. 10/23 at 3 a.m.; Sun. 10/25 at 1 p.m.)

Aired: 10/21/15 | Expired: 10/20/15 | Rating: NR

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