Every year, hundreds of thousands of migrants embark on an arduous journey across the Americas to find refuge in the USA.

And now, incredibly, Chinese migrants are the fastest growing group on this dangerous trail, with over 25,000 entering per year.

With exclusive access, our award-winning team follows several Chinese groups braving narcos, people smugglers and the notorious Darien Gap crossing, revealing why they risk it all to ‘walk the line’.