During the trans-Atlantic slave trade, an estimated 12.5 million people who were enslaved traveled from Africa to the Americas, on 36,000 voyages. Roughly a thousand of these vessels sank, but only a few have ever been found. National Geographic explorer and diver Tara Roberts spoke with “Apple News Today” host Duarte Geraldino about her experience identifying and documenting the remains of slave-ship wrecks — and how she’s hoping to honor the lives of these people who have been all but forgotten by history.