The autonomous underwater vehicle Sentry is designed to dive as deep as 6,000 meters (19,685 feet).
Deep Dives
Image courtesy of Chris German, Woods Hole Oceanographic Institution. Download larger version (jpg, 1.8 MB).

The autonomous underwater vehicle Sentry is designed to dive as deep as 6,000 meters (19,685 feet). It is powered by more than 1,000 lithium-ion batteries - similar to those used in laptop computers, though adapted for extreme pressures - which allow it to dive up to 20 hours.

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