The immigrant workers will live in their own basic housing , dining areas and even restaurants to cater to them. Anthony Bourdain did a segment in the Gulf Region where he visited the Indian and Pakistani construction workers where they lived and ate and joined them for a meal.Not really an issue with most large scale construction projects in region actually. Not because of any human rights issues, but more because of the availability of the number of skilled workers you need for any project getting up over a billion dollars. You have some local hire requirements sure, but most of the time for mega projects like this you are building up a man camp as part of your mobilization and importing a captured labor force.