Three National Geographic Explorers who told us about their research related to rivers and oceans. The health of our rivers has a deep effect in the health of our oceans, and these explorers helped us understand that. Chloe Nunn is a marine sustainability scientist whose research has taken her from deep-sea ecology to Arctic community resilience. Imogen Napper is a marine scientist studying the sources of plastic into our marine environment and surfing on the side. Andrej A. Gajić is pathobiologist, scientist, deep diver, ROV pilot and parachutist. Through his so far career, he published 61 paper and 2 books and mini docudramas for NatGeo, NatGeo WILD, BBC, DW and many more.