One of the biggest is Germany's Volkswagen Urumqi, the capital of China's western Xinjiang region, home to Wickers and other minorities, this is one of the most heavily policed regions in the world.

China's repressive policies against ethnic minorities have been called a genocide by some.

Ranch is also home to German carmaker folks.

Wang's most controversial investment, VW, is three only international car maker to have a plant in the region a way made the decision to build this factory more than 10 years ago.

It was a decision made solely for economic reasons.

There was no political motivation.

The fact that it is now in a politically and socially sensitive environment worries us.

China is covered the region with a massive system off prisons, internment centers and reeducation camps.

Australia's SP Institute has documented 380 facilities across the region.

Hundreds of thousands, possibly millions, have disappeared in these facilities on a recent visit.

It is constantly followed around and stop from filming.

Some of the facilities are official prisons, some are unmarked and some are cynically designated as vocational training centers.

There are several levels off security from high security prisons toe just fenced compound Kyra Some Makana Qasar, born in China, has spent several months in one of these so called vocational schools in 2018.

What they had to learn.

There had little to do with professional skills, he says.

Conditioning.

In this camp, we had to sing the Chinese anthem and other Communist songs thing.

They taught us that China was the strongest country in the world and we had to study materials about the 19th Communist Party Congress thing.

China is portraying the mass detentions as a means to provide opportunities on the job market.

But there's growing evidence of forced labor inside the camps or after release when former detainees have been forced to sign up with employment agencies.

VW says there's no indication off forced labor and its operations shifting and low to direct way higher.

All our employees directly, they send the resume and we have a job interview on then the HR department on the operating department, make a decision based on the resume, and the impression they gave what has happened to them before is something that is hard for us to know.

Extreme Chinese authorities are aware of the controversy.

My minders stay in their car this time, but they call a factory guard over.

Filming is not allowed here.

Did they just tell?

You know, I saw you from my window.

What did they tell you?

They they just supervise our work.

VW says it were stick to its investment, but the controversy is likely to remain economically.

VW's investment never paid off.

It was planned to build 50,000 cars a year here, but its output is less than half that.