39 people were found dead in the trailer of a lorry in Essex last October.
Haulier Ronan Hughes, 40, of Co Armagh, has pleaded guilty at the Old Bailey to the manslaughter of migrants who were found dead in a container in Essex last October.
Thirty-nine Vietnamese migrants, including 10 teenagers, were found suffocated in the trailer of a lorry on an industrial estate.
Hughes was extradited to the UK from Ireland in June.
He was one of several men accused of being part of a people-smuggling ring linked to the deaths.
Eamonn Harrison, from Mayobridge in Co Down, has pleaded not guilty to 39 counts of manslaughter over the incident.
