However, their experienced team are trained to deal with this and investigators would still urge the public not to take any unnecessary risks if you are out walking in the area.
Searches were undertaken inside the main water feature at the entrance of Crathes Castle grounds at 11:00 yesterday morning.
"Over the past two weeks we have had assistance from every available resource at Police Scotland's disposal including the search helicopter, dog unit, dive unit and specialist police search advisers (Polsa). As we enter more challenging terrain every day we are now relying on a 'boots on the ground' approach to ensure dense wooded areas are properly checked. Many areas have also become flooded due to the wet weather so we are also deploying dive units to assist. There is no denying this is a difficult operation and we continue to review our options with every day that passes."
"Two weeks is a long time for any family to be without their son and we continue to keep in contact with Liam's family. Your comments and words of comfort are much appreciated by everyone involved. I would also like to thank the members of the public who have been leaving food and home-bakes for our officers who are searching out at Crathes – we have been shown incredible kindness by the local community.”
Anyone with information can contact Police on 101 quoting ref. no. 1302 of Nov 18.
Liam is white, around 6 foot 4 inches tall and of slim build.
He has short brown hair and walks with a distinctive gait.
He was carrying a camouflage North Face rucksack and was wearing Nike Air Max trainers.
He bought Lucozade, Jaffa Cakes and Dairy Milk at Sainsbury's before he left Aberdeen.
Anyone with information are asked to contact police on 101 using reference number 1302 of Sunday 18 November 2018.