Mystery: Search continues for Martin Tann, 24, missing off Mullaloo Beach Water police and surf lifesavers search waters off Mullaloo for missing man Martin Tann. Picture: Josh Tucker. Police divers and surf lifesavers take part in the search off Mullaloo Beach for missing man Martin Tann. THE disappearance of NSW man Martin Tann, an experienced diver and strong swimmer, remains a mystery as rescue crews continue to search WA's Mullaloo Beach. The 24-year-old, who had attended a cousin's wedding in the state's South-West days earlier, was reported missing by his uncle late last night after he failed to return from the beach. A backpack with his belongings and identification was found on a limestone wall at the second carpark south of Mullaloo point about one kilometre from the beach. Mr Tann, 24, from Narrabri in north-western NSW, was last seen about 1pm yesterday although WA police are now unsure whether he had gone swimming. His disappearance remains a mystery, with police uncertain of whether he has gone missing in the ocean. After his family was contacted, police were alerted around 8.30pm yesterday evening. Land and sea search operations resumed at first light today, including two helicopters, four rescue vessels, a police boat and divers, jet-ski patrols, 12 mounted police and dozens of SES volunteers. Acting Senior Sergeant Peter Trivett, of WA Water Police, said there was always hope of finding him alive and well. "We will search until we have exhausted all possibilities," he said. There's been no reports from the public having seen him. Mr Tann, who was a dive-master and had studied marine biloogy, was a strong swimmer. Senior Sergeant Trivett said police had not ruled out the possibility of a shark attack or that Mr Tann had met with foul play. "There has not been any reported sightings of sharks in the area by (search) helicopters," he said. No shark alarms have been activated either. An immediate air search late yesterday failed to spot any sign of Mr Tann, and a wide scale air, land and water search resumed this morning. Members of Mr Tann's family were at the beach this morning as the search continued. Mr Tann had studied Environmental Science at Canberra University and Marine Biology at James Cook University.