Few of us get to witness the rich and complex ecosystems that live below the oceans' surface—but for Zandile Ndhlovu, venturing deep underwater on a single breath is part of daily life. Lale chats with the South African free diver about her work running The Black Mermaid Foundation, witnessing coral bleaching first hand, weaving sustainability into her travels, and coming face-to-face with a shark. Plus, we hear from a New Yorker about restoring oyster reefs in and around the city.