The 22-year-old went missing on December 8th 2000
Excavation work is getting underway in west Dublin as part of the investigation into the disappearance of Trevor Deely.
Gardaí launched the search on Saturday after receiving new information relating to the Kildare man.
He has been missing for nearly 17 years.
The then 22-year-old went missing after attending his work Christmas party on Friday December 8th 2000.
He was last seen on CCTV footage crossing Baggot Street Bridge and heading towards Haddington Road in Dublin city centre.
Gardaí launched a complete review of the investigation last year.
In April, a fresh appeal into his disappearance was issued after enhanced CCTV footage showed him talking to a man who detectives believe was 'acting suspiciously'.
Gardaí spent the weekend clearing overgrowth and mapping out relevant areas in a woodland by the banks of the River Liffey.
New information has led gardaí to the site in Chapelizod.
Garda dig due to start this morning in Chapelizod where officers believe they have a lead in Trevor Deely case pic.twitter.com/AEVjrUmAgd— Sean Defoe (@SeanDefoe) August 14, 2017
Reporter Sean Defoe is at the scene: "It's a derelict, woodland site here that the gardaí have sealed off.
"Excavation work is due to begin after gardaí received information that Trevor Deely may have been shot and buried at the site by a known Dublin criminal.
"Railings around the site have been covered in black plastic sheeting and a number of detectives have been coming and going from the site this morning.
"Gardaí believe their new information may be a significant breakthrough in the case".
The scene where gardaí are carrying out an excavation in the search for Trevor Deely pic.twitter.com/veHewUefOS— Sean Defoe (@SeanDefoe) August 14, 2017