Journeys to the depths of the ocean.

Webpublished to mark the 150th anniversary of the launch of the challenger expedition, the challenger expedition:

Webexploring the deep tracks the paths of six objects associated with the challenger expedition, including the baillie sounding machine, a starfish, a photographic.

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Webnpr's a martinez speaks with scuba diver and writer susan casey about her new book, the underworld:

Webexploring the deep tracks the paths of six objects associated with the challenger expedition, including the baillie sounding machine, a starfish, a photographic.

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