The police have denied mishandling the evidence or that confessions were extracted under duress.
The mothers of the two Myanmar men accompanied the lawyers to court yesterday after visiting their sons on death row in a prison near Bangkok at the weekend.
“We have submitted this file to the Appeal Court so they can understand more, so they can see the importance on how a death sentence decision needs to be perfectly clear,” Nakhon Chompuchat, the defence team’s head lawyer, said.
“We don’t have new evidence, we are basing this on evidence that was presented earlier,” he said.
The court would likely rule on the appeal next year, he said.
Police drew widespread domestic and international criticism for their handling of the case and the evidence.
Protests erupted in neighbouring Myanmar after the verdict, with many people there believing the two workers were scapegoats.