Dozens of search and rescue specialists scrambled to find missing man in Hilsea in major operation
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Some 40 volunteers from Hampshire Search and Rescue, along with four dog teams, are scouring Foxes Forest in an effort to find the male.
The operation was launched at about 6.30pm, at the request of Hampshire Constabulary.
Search teams have set up a headquarters at the Portsbridge Roundabout car park and are hunting along the Hilsea Lines military fortifications to the east and around the Hilsea Lido site to the west.
The operation was still on-going at 11pm.
Updates to follow.