Staff at Tilbury Docks found 35 people in a shipping container after hearing "screaming and banging" coming from the unit, Essex Police said.
Thirty-five adults and children were discovered inside one container after staff broke in.
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.