The search is focused on a remote stretch of countryside near Hillhead of Auchentomb, north-west of Strichen.
This morning a Police Scotland spokeswoman said: “A number of specialist resources including the dive and marine unit are to be utilised today as searches continue for missing person Shaun Ritchie, 20.
“Divisional officers will be assisted by Search and Rescue Dogs, the Police Scotland helicopter, the Police Scotland Mountain Rescue team and the Royal Air Force Mountain Rescue team as well as specialist dog handlers.”
The specialist divers will also be joined by dozens of members of the public who have pitched in to help searchers comb the remote woodland.
Mr Ritchie was last seen wearing dark grey skinny jeans, a white t-shirt, a grey hoodie and brown trainers.
Police divers drafted in to search for missing Fraserburgh man