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Mysterious sixgill shark
The mysterious sixgill shark lives up to 6,000 feet below the surface of the water. Little has been known about this massive shark -- until now.
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Shark Week:   Mysterious sixgill shark
The mysterious sixgill shark lives up to 6,000 feet below the surface of the water. Little has been known about this massive shark -- until now.
Aired: 7/22/10
Views: 236000
Network:  Discovery
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