Some of the people found inside a shipping container at Tilbury Docks have "significant health problems", police say.
One man has died and others have been taken to a hospital after more than 30 adults and children were discovered.
"One man has sadly died and the others have significant health problems. They are being treated by ambulance crews and are being taken to local hospitals," a police spokesman said.
The uncle of dead Afghan immigrant Meet Singh Kapoor says he wanted a better life for his children. Instead his children watched him die.
ITV News has spoken to the translator police used after 35 Afghan Sikhs, including 13 children, were found in a boat in Tilbury Docks.
ITV News has obtained exclusive footage of people, believed to be Afghan Sikhs, being released from a shipping container at Tilbury Docks.