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NOVA

A Hidden Cause of Sinkholes Is Lurking Underground

Season 51 | 2m 21s

Sinkholes can form either really quickly, or really slowly over a long period of time – and they don’t always come with warning signs.

National Corporate funding for NOVA is provided by Carlisle Companies. Major funding for NOVA is provided by the NOVA Science Trust, the Corporation for Public Broadcasting, and PBS viewers.
Extras
Watch • 0:33
Antiques Roadshow
Appraisal: Chinese Opal Ring with Egg-shaped Case, ca. 1900
Appraisal: Chinese Opal Ring with Egg-shaped Case, ca. 1900
Clip: S28 E18 | 0:33
Watch • 3:20
Antiques Roadshow
Appraisal: 1909 Wright Brothers Homecoming Poster
Appraisal: 1909 Wright Brothers Homecoming Poster
Clip: S28 E18 | 3:20
Watch • 1:03
Antiques Roadshow
Appraisal: 1968 TWA Foreign Accent Paper Uniforms
Appraisal: 1968 TWA Foreign Accent Paper Uniforms
Clip: S28 E18 | 1:03
Watch • 3:29
Antiques Roadshow
Appraisal: Arts & Crafts Roycroft Inn Desk, ca. 1910
Appraisal: Arts & Crafts Roycroft Inn Desk, ca. 1910
Clip: S28 E18 | 3:29
Watch • 3:24
Antiques Roadshow
Appraisal: Austrian Enamel & Ebonized Cabinet, ca. 1880
Appraisal: Austrian Enamel & Ebonized Cabinet, ca. 1880
Clip: S28 E18 | 3:24
Watch • 3:05
Antiques Roadshow
Appraisal: Louis XVI-style Porphyry & Bronze Mirror, ca. 1880
Appraisal: Louis XVI-style Porphyry & Bronze Mirror, ca. 1880
Clip: S28 E18 | 3:05
Watch • 2:57
Antiques Roadshow
Appraisal: 1941 C. F. Martin 000-42 Guitar
Appraisal: 1941 C. F. Martin 000-42 Guitar
Clip: S28 E18 | 2:57
Watch • 0:31
Antiques Roadshow
Appraisal: Duffner & Kimberly Lamp, ca. 1910
Appraisal: Duffner & Kimberly Lamp, ca. 1910
Clip: S28 E18 | 0:31
Watch • 0:49
Antiques Roadshow
Appraisal: Samson Bocage Candlesticks, ca. 1890
Appraisal: Samson Bocage Candlesticks, ca. 1890
Clip: S28 E18 | 0:49
Watch • 0:46
Antiques Roadshow
Appraisal: 24-sheet Billboard Posters, ca. 1967
Appraisal: 24-sheet Billboard Posters, ca. 1967
Clip: S28 E18 | 0:46
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Episode: S51 E7 | 53:40
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Episode: S51 E2 | 53:17
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Episode: S50 E17 | 53:54