A major search was launched after a man is believed to have jumped from a bridge.
Police and coastguard launched the hunt after Michael Stratton is thought to have leapt from the bridge into the water.
The 27-year-old has not been seen or found.
The drama happened at Jackie Spencer bridge in Gosport at 2pm yesterday.
A statement from Hampshire Police said: "We're concerned for his welfare as he hasn't been seen since around 2pm yesterday (Saturday, July 23), when he was in Clayhall Road, Gosport.
"It's believed he was jumping off the Jackie Spencer bridge, known locally as the black bridge, into the water.
"The Coastguard was called, but Michael hasn't been located.
"We'd like to hear from any witnesses, or anyone who has seen Michael since 2pm or anyone with any information.
"Please call 101."
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