The divers will be searching the water at Sawley Marina, near Long Eaton, looking for 22-year-old Josh Bailey, from Leicestershire.
Josh, who is known to get depressed from time to time, was last seen near his narrowboat where he lives by a fellow boat owner at the marina at around 4pm on Friday last week.
He has not been seen or heard from since, which his family say is completely out of character.
Last night Leicestershire Police officers distributed hundreds of appeal leaflets to residents in the area around the marina, as well as visiting boat owners.
But despite enquiries and public appeals for help in tracing Josh, including one made yesterday by his family, Police have received no sightings of Josh.
PC Dave Cross, from the Missing Person Team at Leicestershire Police, recorded a video message urging the public to look out for him.
A force spokesman said: “It is completely out of character for Josh not to maintain daily contact with his family, who themselves recorded their own video appeals yesterday.
“The longer Josh remains missing, our concerns grow for his safety, not least because his mobile phone, from which his family say he is inseparable, has been found on his boat.”
When he was last seen, Josh was wearing black jogging bottoms, dark grey high-top trainers and a short brown hooded coat with fur along all of the external seams and above the pockets.
Anyone who knows where Josh is, or who sees him, is asked to contact police on 101.