Q&A: Tara Roberts, "Written in the Waters"

National Geographic explorer Tara Roberts travels the world documenting underwater wrecks of some of the 12,000 slave ships that operated during the Atlantic slave trade. In her memoir, "Written in the Waters," Roberts talks about the training and preparation required to undertake the diving missions and the work done by the nonprofit organization that she dives with, Diving with a Purpose, which is primarily composed of African American divers.      

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