Experts estimate there are more slaves today than there.

Bennett.

Any time in history.

48.5 million people currently live in some form of bondage, according to the Global Slavery Index.

This includes people who are forced toe work forced into marriage but and sold as commodities.

The United Nations says human trafficking effects almost every country on Earth as part of CNN's Freedom Project, which aims to draw attention to modern day slavery and exposed the criminals who trade in it.

We're taking a look at a program that gave some students a sense of what forced labor is like.

I need you to take a bolt slower.

Another row here, five in a row.

It's 8 30 in the morning at this Hong Kong high school, but this is not a regular day.

My name is Mr Friedman.

I run a company in our company, makes nuts and bolts, and you have one of them in your hands.

Classes are canceled.

Mr Friedman says their labor is his for the next five hours, and you're going to take the not you're gonna put it on the bolt.

You're gonna take the knot and put it on the boat continuously.

I do not want you to talk to anyone else.

I don't want you to even make eye contact with me.

The minutes crawl by.

The students look bewildered, confused, even angry.

You come over here.

You're not doing it faster.

Stand over here and do it faster.

Time is money.

Come on.

Faster.

Okay.

Give her detention right here.

Just because Don't drop the bolt.

Every detention, the teenagers struggle.

The process is painfully slow.

You're done.

Then Mr Friedman reveals his true intentions.

This was a simulation.

It was to give you an opportunity to experience what it's like for a short period of time to lose control of your life, to help them understand what it's like for the millions trapped in forced labor.

When I was doing it, my hand started sweating.

I was sweating, so I can't basically imagine how people would do it for, like, 14 15 hours every day.

Do you think it was fair?

No.

No.

Did you like me?

Okay.

Thank you very much.

I was pretty close to walking out.

I just an hour from their school day designed to drive home the realities of modern day slavery and experience intended to motivate young people to try and make a difference.

I would definitely feel more sympathy for those who are like in slave labor.

I feel like as students, we can actually raise awareness about this issue.