Biddle claims the 27-year-old father-of-three, who was buried in a family plot at Memorial Park Cemetery in Christchurch, always wanted to be cremated.
Pooley's whanau deny the claims and do not want him disturbed.
Biddle took legal action to pursue the move, which has parallels with the James Takamore case.
On day three of the hearing, Geoffrey Robert Topham-Hall, owner and director of Geoffrey Hall Funeral Services Ltd, said Pooley's remains would now "likely be a jellified and liquefied mess".
The MDF casket, along with medium-to-high water level tables of Memorial Park Cemetery, mean that now, five years after his burial, it would be "extremely unlikely" that Pooley's remains could be removed "in a complete or semi-complete state", he said.
Topham-Hall, who has been involved in five or six disinterments, says exhumations are always carried out before sunrise given the sensitive and "potentially-distressing nature" of the process.
Funeral directors, the council sexton and staff, along with a district health board health officer, and any family members, would usually be present, he said.
"The entire operation is very difficult and very unpleasant," Topham-Hall said.
Newton, a sexton with 11 years' experience who has carried out more than 20 disinterments in various stages of decomposition, said the "highest level of respect" is given to the remains at all times.
The day before the exhumation, cemetery staff would go down to the casket to examine its condition and see what steps would be required in order to disinter the remains.
After five years, it was likely that Pooley's casket had since collapsed and become "soggy".
He expected Pooley's skeletal remains to still be fully intact, but accepted that some jellified remains might be found.
Disinterment, Newton said, was "obviously very highly emotional".
"It's very upsetting and it doesn't take much to push people over the edge," he said.
Pooley's father Bruce Pooley today made an emotional plea for the case to be thrown out.
"As his father, I want him to stay where he is."
The civil trial, before Justice Gerald Nation, will continue tomorrow with closing submissions.
Once the evidence is heard, and submissions are complete, Justice Nation is expected to reserve his decision.
