A woman who helped clean a unit where two people had been beaten before being forced into a toolbox and dumped in a dam has told a court she saw the pair tied up in the hours before they were killed.
The bodies of Cory Breton and Iuliana Triscaru were found locked in a toolbox in a dam at Kingston, south of Brisbane in 2016, more than two weeks after they went missing.
Tuhiranghi-Thomas Tahiata has pleaded not guilty to two counts of murder.
The Supreme Court in Brisbane was told Mr Tahiata is one of several people charged in relation to the deaths.
Ms Triscaru's friend Ngatokoona Mareiti gave evidence at the trial on Friday.
The court heard she went to a Kingston unit to buy drugs and when she arrived, she saw Mr Breton and Ms Triscaru sitting on a lounge with their hands and ankles bound.
"They had the grey tape around their arms and their feet, legs," Mareiti said.
"I said 'What the f*** happened to you?'"
'They were screaming'
Mareiti told the court she searched Ms Triscaru's bra and found ice.
She was sent out to buy alcohol and cleaning products, including methylated spirits and cleaning cloths, the court heard.
Mareiti told the hearing that when she arrived back at the unit, Ms Triscaru and Mr Breton were inside the toolbox, which had been moved to the lounge room from the garage.
"They were screaming," Mareiti told the court.
She said another man was either sitting or standing on the toolbox.
The court heard Mareiti helped clean up water off the lounge room floor with towels.
She said she saw the toolbox opened and Mr Breton and Ms Triscaru tried to escape, but several men put wet towels and sheets into the toolbox, and it was again shut.
The court heard the toolbox was loaded onto a truck and driven away.
Mareiti pleaded guilty to two counts of manslaughter for her role in the deaths and was sentenced to nine years in jail.
The trial continues.
