From the looks of it, the best chance you have to escape is before they get you to the river. So if you ever find yourself in a situation where you’re travelling for a job in one of these countries, be aware of the signs, and escape before it’s too late.
So, if you get picked up from the airport and you’re supposed to go to a hotel only 10 min away, but that turns into a drive for a few hours, do whatever you can to get out. Anywhere is better than the destination at the end of that drive.