The North Korean women who had to escape twice

Trafficked into the sex industry after defecting from North Korea, two young women spent years in captivity before finally getting the chance to escape.

From the third floor of a residential tower block in the Chinese city of Yanji, two young women hurl their torn up, knotted bedsheets out of a window.

When they pull the sheets back up, a proper rope has been tied on.

They climb out of the window and begin their descent.

"Quick, we don't have much time," urges their rescuer.

Safely on the ground, they turn and run to a waiting people carrier.

But they are not yet out of danger.