Honolulu firefighters suspended their search Thursday for a diver lost at sea after four days of looking without finding further signs of the man.

Matthew Curley, 28, was reported missing Monday when a scuba dive tour regrouped and couldnt find him about half a mile from shore at Waialae-Kahala. The Honolulu Fire Department and Coast Guard launched a search, but the Coast Guard called its search off Tuesday night.

Firefighters requested the help of the Coast Guard to search by air while the fire helicopter was being serviced, said Honolulu fire Capt. Terry Seelig.

The Coast Guard searched from Barbers Point to Honolulu Harbor. Firefighters extended their search from Makapuu to Rabbit Island. Divers with the department searched underwater and firefighters on Jet Skis and surfboards checked rocky coastlines inaccessible by foot.