Dive squad joins search for Christchurch builder Michael McGrath

The police dive squad is joining the search for missing Christchurch builder Michael McGrath.

Police say investigations are now turning to a number of waterways in Halswell.

Detective Inspector Darryl Sweeney said the divers would complement the land search in the Christchurch suburb.

Sweeney also said police expected to finish searching a property of interest on Candys Rd tomorrow.

This week police released new security footage of McGrath leaving the Halswell New World on May 19 and 12.38pm.

The 49-year-old builder was last seen at his home on Checketts Ave in Halswell on May 21.

McGrath, who lives alone, was reported missing two days later.

Police were continuing to assess information received from the public.

Sweeney said investigators remained committed to the missing person case.

"We want to find Michael McGrath," he said.