Exclusive: National Geographic has handed renewals to two of its Emmy-nominated series, Trafficked: Underworlds with Mariana van Zeller for a fifth season, and Animals Up Close with Bertie Gregory for a second season.

Production is underway on the new season of both series.

The newest season of Trafficked continues to spotlight van Zeller’s high-stakes, critical investigations into the black markets that dominate half the world’s economy.

Each episode follows van Zeller as she investigates a different underworld to talk to the players, learn the business, and better understand the world’s multitrillion-dollar shadow economy. She travels across the globe and meets with everyone from traffickers, smugglers, assassins and terrorists to law enforcement, government officials, experts, victims and more to provide a 360-degree look into these global underworlds.

“Trafficked has been an incredible journey, and it’s one that I am honored to continue with my team and our partners at National Geographic,...