Adam Robinson was found crying for help in a wheelie bin by a dog walker in a secluded area of a Ballymena park last Tuesday afternoon.
The 20-year-old was badly beaten, stripped naked and put into the bin head first.
"We don't know how much longer he would have survived," Adam's father Mervyn on Monday as police reissued an appeal for information into the incident.
When the police called me I hardly recognised our son.
Mr Robinson continued: "He was badly beaten, was cut and bruised, had knife marks all over his body with a footprint on his body.
"The hospital's main concern was for his liver and his kidneys and his left knee is also in an awful state."
A man out walking on Tuesday afternoon in the Sentry Hill area noticed his dog was barking at something, he found the blue bin taped up wedged below a tree in a secluded area surrounded by nettles and hearing Adam crying out he opened the bin and freed him.
"Adam had been left to a long lonely slow death and our sincere thanks and prayers go out to that man who found him."
Mr Robinson said he last spoke to his son at around 7pm the night before the attack and, contrary to claims made in court, his son had not been partying for a week.
He added: "There are witnesses who saw the blue bin being wheeled around the area on Tuesday.
"Please come forward and speak to the police. We really need your evidence and your help."
Wilma Stewart, the victim's mother added: "Although there are suspects in custody for what I think is a heinous crime I want to make sure that this cannot happen to anyone else's son or daughter.
"I would just like to take this opportunity to thank everyone friends, family and neighbours for their good wishes and support."
Investigating officer, Detective Chief Inspector Tracey Mageean also appealed for the public's help.
This has shocked people and brought really negative attention to Ballymena.
DCI Tracey Mageean
She added: "I believe that people will have seen part this incident take place in the Doury Road, Dunclug or Dunvale areas of Ballymena between late morning and the afternoon of Tuesday September.
"I want those people to come forward to us to provide that information.
"We need you to come forward and tell us what you saw.
"There is a young man in hospital being treated for significant injuries following a shocking ordeal.
"Although we've charged three people, however my detectives continue to investigate the matter and build the case.
"So, if you were in area please contact police.
"Any information, no matter how small, could be very important to the investigation.
"We are working to bring those involved in this horrific ordeal before the court but we need your help to do it."
Last week a Ballymena Magistrates' Court heard that Robinson's last memory before waking in the bin was being "viciously assaulted" in the bathroom of an end terrace house in the Dunclug estate.
Paula Wilson, 20 and from Millfield; David Roddy Patterson, 26 and from Glendun Drive; and Teri Lau, also 26 and from Dunclug Park - were charged with attempted murder and false imprisonment.
Patterson and Lau were remanded in custody, while Wilson was released on bail.
All three defendants were ordered to appear again at Ballymena Courthouse on 3 October.
A third man arrested in connection with the incident was released on police bail pending further enquiries after a detective constable said he had provided alibis for his whereabouts at the time of the attack.