Mum Nicola Urquhartis,right, leading the search for her missing son Corrie McKeague
Nicola Urquhart, 48, joined 140 searchers to scour the area where her son’s phone signal was last picked up.
Five cadaver dogs, trained to sniff out bodies, were also used along with drones equipped with cameras.
They were joined by 40 supporters from among more than 100,000 Find Corrie Facebook page followers.
But the eight-hour search of fields, woodland and tracks failed to find any trace of Corrie, 23, who vanished last September while on a night out in Bury St Edmunds, Suffolk.
The mother joined 140 volunteers as they scoured the area where the RAF airman went missing
His girlfriend April Oliver, 21, has since discovered that she is expecting his baby.
Searching like this is hard because I know I am looking for a body
Mum Nicola Urquhart
Mrs Urquhart said: “I have to think there is a chance he could be out there and being held against his will and that he might come back alive.
“But searching like this is hard because I know I am looking for a body.
“It was difficult to deal with but I’ve got to look for him. I’ve got to try and find him.”
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Corrie girlfriend, April Oliver, has discovered she is having a baby
The mother of three from Dunfermline, Fife, who is a family liaison officer with Police Scotland, has previously criticised police for not doing enough to find her son.
But today she insisted she remained supportive of Suffolk Police and just wanted to do what she could to help.
She said: “The police are behind what we are doing 100 per cent. It is simply not possible for the police to search every single area for every single missing person.”