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NOVA Online: Titanic's Lost Sister (see bottom of page for navigation)
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The submersible 'Alvin'Climb inside a submersible and you can descend to depths around 6,096 m (20,000 ft). Underwater submersibles usually come equipped with motors and propellers (to move around), cameras and floodlights (it's dark down there), and mechanical arms (to pick up things).

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Photograph courtesy Woods Hole Oceanographic Institute


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