Just a reminder for wannabe divers beware of Sharks! All diving operations at Garden Bay, in Sydney Harbour, have been suspended as Navy boat crews search for a shark that attacked one of their own. A Navy clearance diver suffered serious wounds to his hand and thigh when a shark attacked him just before 7am (AEDT) on Wednesday. He was taken to St Vincent's Hospital, where a spokesman at 11am (AEDT) said he had undergone surgery and was now in intensive care in a serious but stable condition. "He's improved a little bit," the spokesman said. "He's out of surgery and he's in recovery." The man, who has not been named, was in the water with a police diver as part of an underwater trial to test new naval defence technology at the time. The divers and a safety boat were somewhere between HMAS Kuttabul Navy Base at Garden Island and Mrs Macquarie's Chair. Australian Fleet Commander Rear Admiral Nigel Coates said it was the first time he had heard of a navy diver being injured in such an incident. "I believe it's the first time that one of our divers has been attacked by a shark," Admiral Coates told reporters in Sydney. Since February 2, the Navy has been conducting its Kondari Trial to test new technologies designed to protect Australia's ports, naval bases and ships from water attacks. The trials include detecting divers with SONAR equipment and using remotely operated underwater vehicles to inspect the hulls of ships, as well as piers and surrounding sea beds. But those operations have been called off following the attack. "We have suspended our diving activities over this exercise until further notice," Admiral Coates said. "I understand there are boats out looking for the shark." The divers involved in the incident could not identify the species or size of the shark. "The attack occurred very quickly," Rear Admiral Coates said. "The shark attacked the diver (and) our diver punched the shark, I believe, a couple of times. "The shark then disappeared very quickly - it was all over, I'm told, in a few seconds." The injured diver was then hauled into a nearby safety boat, given first aid and taken by ambulance to St Vincent's Hospital for surgery. The last shark attack in Sydney Harbour was at Athol Bay, near Taronga Zoo, in 2000, and the last fatal shark attack in the harbour occurred in 1963, Mr West said. Martha Hathaway was killed by a bull shark at Middle Harbour in 1963.