Two Northern Ireland lorry drivers, Stephen McLaughlin and Martin McGlinchey, were convicted of conspiracy to facilitate illegal entry into the UK following a retrial in London yesterday.
At Basildon Crown Court McLaughlin, aged 36, of Rose Park, Limavady, was jailed for eight years, while 49-year-old McGlinchey, of Derryloughlan Road, Dungannon, received a sentence of nine years.
The Afghan Sikhs, including 15 children, were discovered on August 16, 2014, after port workers at Tilbury Docks in Essex heard banging noises and cries for help.
When officials opened the container, the asylum seekers were found in cramped conditions, crammed on top of plastic barrels full of liquid, with condensation pouring from the ceiling.
Among them was Meet Singh Kapoor, a 40-year-old who died during the overnight P&O ferry crossing from Zeebrugge, Belgium.
The court heard that a post-mortem examination found Mr Kapoor had died of natural causes.
Police said his family, who were travelling with him, watched him die and were powerless to seek medical help in the dark container that had just two air holes.
There were no toilets and the children were sick in carrier bags. At one point, the air holes were closed as other containers were loaded next to theirs, police revealed.
The jury was told the asylum seekers were the human cargo of a sophisticated international organisation of people smugglers.
The court heard the asylum seekers had paid thousands of pounds to travel to the UK to escape persecution from radical Muslims in Afghanistan.
Evidence before the court revealed that the men had paid around £28,000 per family for the crossing, raising the cash by selling their businesses, stock and family jewellery.
McLaughlin and McGlinchey were part of a team responsible for arranging the transport logistics of the people smuggling operation.
The pair organised for the container to be sent from Dover, Kent, to France so it could be picked up before being loaded with asylum seekers on a Belgian industrial estate.
A third man, Taha Sharif, 39, of High Cross Road, Tottenham, north London, was found guilty of the same offence following a trial last July. He will be sentenced on June 23.
Detective Chief Inspector Martin Pasmore, of Essex Police, said afterwards: “Vulnerable people seeking help were treated in an appalling way at the hands of these greedy criminals, which prevented any prospect of medical help for Mr Kapoor.
“My thoughts remain very much with his wife, children, family and friends, and the other surviving asylum seekers who endured such distressing and shocking conditions.