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National Geographic

Mariana investigates the illegal trade in shark fins, going face-to-face with hunters and smugglers and undercover to explore the demand in the U.S.

Trafficked With Mariana van Zeller

Mariana investigates the deadly world of illegal street racing.

Mariana investigates a wave of anti-LGBTQ+ violence and uncovers a well-funded global network pushing an anti-gay agenda around the world.

Mariana investigates the dirty business of bogus addiction treatment.

Mariana investigates the growing influence of heavily armed militias.

Mariana investigates the explosive world of armored car heists.

Mariana travels to Vietnam to investigate reports that young women are being trafficked into China to be sold as unwilling brides.

Mariana investigates the mysterious next wave of America's opioid crisis.

Mariana heads to a Southeast Asian hotbed of scamming, where criminal organizations are holding thousands of hostages and forcing them to scam.

Mariana explores the growing influence of Mexican cartels in the U.S.

Mariana van Zeller explores the complex inner-workings of the global underworld, black and informal markets.