Cuba is home to some of the Caribbean’s most pristine coral reefs, in part because of the lack of tourism. As President Obama began normalizing relations with Cuba, Amy Apprill began working with Cuban scientists to study their reefs. Now, for the first time, a joint Cuban-American expedition has delved into the highly protected Gardens of the Queen reefs. But political tensions make the future of the work uncertain. We talk to Amy Apprill, a scientist at Woods Hole Oceanographic Institution and the co-leader of the expedition.