When asylum seekers like Reza Berati try to come to Australia by boat, they are not only sent to remote islands, they're sent to detention centres that have been outsourced to massive global companies. The three firms that run these centres have a vast reach and are involved in everything from nuclear weapons to coal seam gas and "investigative services". Two are under investigation for serious fraud.

So when 23-year-old Berati died of a head injury inside PNG's Manus Island camp a week ago, amid contested allegations that the camp's security guards were involved in a riot, it's hard to get answers from the Australian government. It does not run the camp and it does not employ the guards. A British security firm called G4S does.