1. The Tunnels of Gaza

Suffering under economic blockade, Gazans use an illegal network of tunnels to smuggle in goods to survive. But the tunnels are under attack from Israel and Egypt.

2. Kamikaze Gas Smugglers

Taking advantage of Venezuela's subsidized gas, Colombian smugglers known as kamikazes eek out a precarious living by smuggling this highly explosive commodity.

3. Dark Web

A secret part of the Internet is revolutionizing drug dealing.

4. Syrian Refugee Girls

Desperate young women fleeing the Syrian war are being trafficked into the sex trade under the guise of religion.

5. Poaching Pangolin

The world's most trafficked mammal may go extinct before most people know what it is.

6. Sugar Babies

A new kind of dating blurs the line between prostitution and romance.

8. Crime Towers

Scammers setup shop for their criminal enterprises inside London's public housing.

9. Vietnam's Transgender Underground

In Japan, young gangs look to break away from the older Yakuza through underground violence.

10. Underground Fighting

In Japan, young gangs look to break away from the older Yakuza through underground violence.