Special sonar equipment is being used in the search for an elderly boater who went missing on the Norfolk Broads.
David Cubberley, 65, was last seen in Hickling Broad last Wednesday before a member of the public found his boat in the reeds at Candle Dyke several days later.
Water search teams from Norfolk Lowland Search and Rescue, Norfolk Fire and Rescue Service and Norfolk Police's Marine Unit have since been scouring the broad and will be deploying advanced sonar equipment to help.
Inspector Ben Hardiman, who is leading the investigation, said: "Given David's sudden disappearance and the length of time he has now been missing, we are becoming increasingly concerned for his welfare.
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"There will be a police presence in the area over the coming days as we continue our efforts to find him.
"So far, we have completed extensive CCTV enquiries, spoken to residents and searched surrounding land.
"I would like to thank the public for their assistance with this appeal so far and urge anyone with any information about David's whereabouts to contact us."
Anyone with any information about David's disappearance should contact Norfolk Police immediately on 101, quoting incident number 271 of February 17.
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