Police have found a body they believe could be missing Sydney man Gary Tweddle almost six weeks after he vanished in the Blue Mountains.
Police said the body was found by an ambulance rescue helicopter during a training exercise near bushland in Leura about 4pm, police said.
Blue Mountains crime manager Mick Bostock said police rescue officers would not be able to retrieve the body until dawn on Tuesday.
"It’s too dangerous, they are going to have to wait to retrieve the body tomorrow,’’ Inspector Bostock said.
''It's very likely it is Gary but we will have to wait and see,'' he said.
‘‘Earlier this afternoon an ambulance helicopter was involved in a training exercise near bushland at Leura in a remote area where there is a rock climb known Sweet Dreams. They have located what appears to be a body.’’
Police said there was a good chance the body was Mr Tweddle but could not be certain until tomorrow.
"The area can only be reached by abseiling down the rock face," Inspector Bostock said
"The body appears as though its wearing clothing," he said.
The British-born computer sales representative, from Cremorne on Sydney's north shore, disappeared from the Fairmont Resort at Leura during a work conference on July 15.
Police only filed a report to the coroner declaring his disappearance as an accidental death last Wednesday.
His disappearance sparked the biggest search very conducted in the Blue Mountains with more than 1000 volunteers.
Mr Tweddle went to dinner at Silk's Brasserie with a group of 45 work colleagues at 7pm.
The staff at Silk's Brasserie say Mr Tweddle had not had a lot to drink during dinner, but remember him being ''unsteady'' and ''wobbly'' on his feet when he left.
A taxi driver from Leura-Katoomba Radio Cabs told Fairfax Media he remember dropping Mr Twedde and his work colleagues back at the Fairmont.
Soon after Mr Tweddle was dropped off security footage captures him running out of the Fairmont without his jacket or glasses.
He spoke to colleagues for 17 minutes and said he was lost and did not know where he was.
Police says he told his colleagues he was running and sounded as he was jumping or leaping over things as he spoke to them.
They pleaded with him to stay where he was and to look in a letter box to find out exactly where he was on Watkins Road.
A motorist told police they saw him standing on the middle of the road on the phone. A short time later his phone battery died and he has not been seen or heard from since.
Gary's family and girlfriend Anika Haigh have spent the past six weeks praying for a miracle ever since.
His father David and step-mother Michelle had flown from the UK to help with the search as had his mum Carol and her partner Clive travelled from Queensland.
In an earlier interview with Fairfax Media Ms Haigh said she had lost her best friend.
''My best friend has been taken from me and it's so hard. It's horrible, I just miss him so much. My heart aches, it hurts, I didn't even know I had these emotions.''
''He is one of the most kind, caring, loving, and passionate person that I know and he is extremely determined," Ms Haigh said.
"He is a very loved person and we are touched and overwhelmed by all the friends an family that have come and helped in this situation."
Mr Tweddle's family and friends have taken to Facebook to appeal for any information. A Facebook page titled "Have you seen Gary Tweddle?" has more than 4,500 likes.
