A search operation is underway at Cleethorpes tonight.
Humberside Police and Humber Coastguards search for a 40-year-old man.
The lifeboat was deployed at approximately 5:25 pm as part of efforts to locate it.
A Humberside police spokesman said: "We have received reports of concerns about the safety of a 40-year-old man.
"Our teams and coastguards are looking for him."
A Humber Coast Guard spokesman said: "We received a call from the Humberside police.
"We help them with an incident.
"We sent some teams and asked the lifeboat to react."
A witness said police and coast guards patrolled an area near Wonderland.
The full circumstances of the incident are not yet known.
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