Radio Expeditions NPR's Alex Chadwick concludes his National Geographic Radio Expedition with marine biologist Sylvia Earle, as she explores and discovers unfamiliar regions and life-forms in the ocean. Earle and other marine biologists operate small submarines that can stay hundreds of feet undersea for hours at a time. They're more responsive than remotely operated vehicles and can go much deeper and stay longer than divers equipped with scuba gear. (7:40
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Radio Expeditions

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Radio Expeditions

Radio Expeditions

Radio Expeditions

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  • <iframe src="https://www.npr.org/player/embed/1133909/133909" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

NPR's Alex Chadwick concludes his National Geographic Radio Expedition with marine biologist Sylvia Earle, as she explores and discovers unfamiliar regions and life-forms in the ocean. Earle and other marine biologists operate small submarines that can stay hundreds of feet undersea for hours at a time. They're more responsive than remotely operated vehicles and can go much deeper and stay longer than divers equipped with scuba gear. (7:40