The search area will be focused around Kildare.
Gardaí and members of the Defence Forces are searching an area in Kildare for a missing Laois man.
A team of up to 30 will be assisting in the search of a site in Monasterevin.
Portlaoise's William Delaney was last seen on January 30th.
Gardaí along with members of the water unit and soldiers are expected to spend up to six days searching the area.
A previous search was carried out at the Rock of Dunamase and two people were arrested last June after a member of the public claimed the 57 year old was assaulted and buried near the popular tourist attraction.
However, the man in his 30s and the teenage girl were both released without charge and investigations have been on going.
Superintendent Anthony Petit from Portlaoise Garda Station says they are now focusing on Monasterevin, as it was the last place the 57-year-old was seen:
Anyone with any information is asked to contact Portlaoise Garda Station on 057 86 74100.