A lone officer stood guard at the dig site as the search for the missing man intensified.
The continuous flow of gardai entering the sealed-off woodland in Chapelizod was an indication of just how extensive their search has become.
A black canvas stretching across the site, along with a significant density of trees, separated the high-profile operation from the Lucan Road. At one stage, several large, empty bins were taken off a truck and pushed on to the site.
Two workers in high-visibility jackets were also seen tending to a large water tank mounted next to a tall floodlight.
Inside, a digger was parked on a clear expanse of land without any evidence of it having been used throughout the day.
Members of An Garda Siochana arrived, mostly in unmarked cars, to assess the area and make preparations for the dig.
The recently reinvigorated investigation followed new information which alleged that Trevor, who was 22 when he disappeared in December 2000, was shot before his body was dumped in west Dublin.
It is expected this search operation will take about two weeks.
However, it is understood officers are hopeful a discovery could be made within a matter of days, should the information prove correct.
Trevor's parents, Michael and Ann Deely, who live in Naas, Co Kildare, have been robbed of their son and left without answers for 17 years.
The suspicion he was murdered and dumped in secluded woodland three weeks before Christmas is almost too tragic to put into words. It was not clear if the family had visited the dig site, or if they were waiting for news from their home. But should Trevor's remains be found, it would provide a measure of closure to his devastated loved ones.
A discovery would also shed light on whether there is any substance in the allegation that a well-known Crumlin criminal is responsible for Trevor's murder.
The individual who has given information to gardai has not supplied any motive for the alleged murder of the former bank worker.
However, it is understood he claimed Trevor was killed after having an interaction with the criminal on the morning of his disappearance.
Trevor's high-profile disappearance almost two decades ago resonated with families throughout the country.
It gained massive media attention as it reflected every parent's worst nightmare. Social media users have been offering their thoughts and prayers for his family.
"After 17 years Trevor's family deserve to know what happened to their son," wrote one woman.
"Please God, bring him home," she added.