Published Thursday, 21 August 2014
Brendan Megraw, 23, vanished from west Belfast in 1978. (© UTV)
The investigation will focus on land at Oristown where it is thought that Brendan Megraw - who was abducted and killed by the IRA in 1978 - was secretly buried.
Work is due to begin in the coming days.
Geoff Knupfer, lead forensic scientist with the Disappeared commission, said: "We will carry out an initial survey of ground that is on the site where we think Brendan could be buried but has not previously been analysed.
"This will involve a team of forensic archaeologists using ground penetrating radar to try to identify anomalies beneath the surface that may warrant further investigation and a fresh search".
Between 1972 and 2003, 17 people have been acknowledged as "disappeared" during the Troubles, having been kidnapped, murdered and disposed of in unmarked graves by republicans.
The remains of 10 bodies have been recovered.
Brendan Megraw, a 23-year-old newlywed, vanished from west Belfast in 1978, and is believed to be interred near Kells in Co Meath.
There have been three unsuccessful searches for Brendan, the most recent in 2010.
Mr Knupfer said a team of forensic archaeologists will use ground penetrating radar to try to identify anomalies beneath the surface as part of the newly announced geographical survey.
Over four hectares of the Oristown bog have been searched and a further 2.5 will now be covered.
© UTV News