The Regional Police Underwater Search Team are due to begin an underwater search of the River Ouse as part of the enquiry to locate missing York man, Chris Baker who went missing on 20th December 2012.
The search team will launch the boat at Naburn lock and will travel upstream towards York.
The 29-year-old was driving to work at Hull Royal Infirmary when he suddenly abandoned his grey Renault Megane on Skeldergate Bridge in York city centre.
He then gestured to a woman in the car behind him before jumping over the wall of Skeldergate Bridge on to the banks of the River Ouse.
He has not been seen since.
River levels have dropped sufficiently to allow a safe search of the river.
He is described as white, around 5ft 9in tall, with a slim build and curly, dark brown hair. He was wearing a striped work shirt when he was last seen.
More top news
More than 30 firefighters have been tackling a fire at a block of flats in Gateshead.
High pressure brings settled and warm weather.
Turkish defender Alim Ozturk has become Sunderland's first signing of the summer.